What Is UUP Dump?
UUP dump is a website that makes it easier to obtain Windows installation files from Microsoft's Unified Update Platform and turn them into a usable Windows ISO.
Instead of downloading a finished ISO from Microsoft, UUP dump lets you select the Windows build you want and then generates a package containing the files and scripts required to download and assemble that particular build.
The process gives you control over several things that are normally fixed in a pre-built ISO, including the Windows version, architecture, language and editions.
Choose the Windows build you want → choose the language and editions → download the UUP files → let the converter integrate the required updates → receive a Windows installation ISO.
Why Use UUP Dump?
A normal Windows ISO is already assembled. UUP dump takes the opposite approach: it lets you construct the installation image from Microsoft's UUP files.
This can be particularly useful when you want installation media containing a relatively current Windows build instead of starting with an older ISO and downloading a large number of updates after installation.
It is also useful for people who maintain their own Windows installation-media archive and want to periodically create fresh images.
Another advantage is flexibility. You can choose whether the ISO contains only the standard editions you need or whether additional editions should be generated during the conversion process.
Start by Choosing a Windows Build
The first important decision is the Windows build.
UUP dump lists builds by release type. You will commonly encounter entries such as Cumulative Update and Feature Update.
If your objective is to create an updated Windows installation image, choose the Feature Update. This is also the recommendation in UUP dump's own FAQ. UUP dump's FAQ says that Cumulative Update entries generally are not useful for creating an updated image, so they should be avoided for this purpose.
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UUP dump can show both Cumulative Update and Feature Update entries for the same Windows build.
For example, the Windows 10 22H2 list can show both:
- Cumulative Update for Windows 10 Version 22H2
- Feature update to Windows 10, version 22H2
For creating a normal updated installation ISO, select the Feature Update entry.
If you are unsure which entry to choose, UUP dump itself says to choose the Feature Update when creating an updated image.
The Worked Example: Windows 10 22H2
For this guide, the selected build is Windows 10 version 22H2, build 19045.7663, x64.
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The build page shows the selected build number, architecture, channel and date information before you proceed.
The important thing is that this is a Feature Update selection, rather than the Cumulative Update entry we initially selected while working through the process.
Choose the Language
After selecting the build, UUP dump asks you to choose the desired language.
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In this example, English (United Kingdom) is selected.
The language selection determines the language resources included in the Windows image. It does not change the underlying Windows build.
Choose the Windows Edition
The next step is choosing the Windows editions you want in the ISO.
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For a normal Home and Pro ISO, simply select:
- Windows Home
- Windows Pro
UUP dump also shows additional editions that can be generated from those base editions.
| Additional edition | Required base edition |
|---|---|
| Windows Home Single Language | Windows Home |
| Windows Pro for Workstations | Windows Pro |
| Windows Pro Education | Windows Pro |
| Windows Education | Windows Pro |
| Windows Enterprise | Windows Pro |
| Windows Enterprise multi-session / Virtual Desktops | Windows Pro |
| Windows IoT Enterprise | Windows Pro |
UUP dump requires the appropriate base edition to be selected first. Additional editions can then be generated through the third download method on the summary page.
If you only need Home and Pro, there is no reason to add the additional editions.
The Download and Conversion Options
After choosing the language and editions, UUP dump presents the summary page.
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There are three download methods.
1. Download UUP set
This option downloads the selected UUP files without automatically converting them into an ISO.
UUP dump uses aria2 for downloading the files. This option is useful if you want to handle the UUP files yourself or perform the conversion separately.
2. Download and convert to ISO
This is the easiest option when the goal is a finished Windows ISO.
UUP dump downloads the required UUP files and then runs the Windows conversion process to assemble them into installation media.
This is the option used for this guide.
3. Download, add additional editions and convert to ISO
This option also converts the UUP set into an ISO, but it additionally creates the extra editions selected on the summary page.
Use this if you want one ISO containing more editions than the normal base selection.
Understanding the Conversion Options
Below the download methods are four conversion options. Each one does something different.
Include updates
This is one of the most important options when creating an updated Windows ISO.
An UUP set is not necessarily a single image that already contains every file corresponding to the build number shown on the website.
Instead, it can consist of a base Windows image plus update packages that bring that image up to the selected build.
UUP dump's FAQ specifically explains that failing to integrate those updates can result in an ISO containing the base build rather than the version selected on the website.
Therefore:
↓
Base Windows image
↓
Required update packages integrated
↓
Updated Windows image
This is why Include updates is not simply an optional collection of extra patches. It is part of the process that makes the resulting image correspond to the selected build.
Run component cleanup
This performs component cleanup after the Windows image has been serviced.
When cumulative updates replace older Windows components, the component store can contain superseded material. Cleanup removes components that are no longer needed where possible.
For a personal installation ISO, enabling this is generally sensible.
Integrate .NET Framework 3.5
This is a separate feature from the normal Windows cumulative update process.
If enabled, UUP dump integrates the .NET Framework 3.5 Windows feature into the image.
This can be useful if you regularly install older applications or games that require .NET Framework 3.5.
If you do not need it, leave it disabled. There is no requirement to enable .NET 3.5 simply because you are creating an updated Windows ISO.
Use solid (ESD) compression
This enables solid ESD compression for the installation image.
It can reduce the final image size, but it can also increase processing time. If saving some ISO space is more important than conversion time, it can be useful.
Otherwise, leaving it unchecked keeps the process simpler.
What Are the "Additional Updates"?
The summary page can show an Additional updates section.
This wording can be slightly confusing. It does not mean that UUP dump is going to update every application installed in Windows.
It refers to Windows update packages associated with the selected UUP set that can be integrated during the conversion process.
Our original Cumulative Update selection provided a particularly useful example because the update list showed exactly what was being integrated.
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In the earlier Windows 10 22H2 cumulative-update example, UUP dump showed these packages:
| Package | Type | Purpose |
|---|---|---|
SSU-19041.7546-x64.cab |
SSU | Updates the Windows servicing stack used to install and service Windows updates. |
windows10.0-kb5015684-x64.cab |
Enablement | Enables the Windows 10 22H2 feature configuration. |
Windows10.0-KB5120249-x64.cab |
LCU | The August 2026 cumulative update that brings Windows 10 22H2 to build 19045.7663. |
That list is a good demonstration of what "Include updates" actually means.
These are Windows servicing and update packages. They should not be confused with updates for Microsoft Store applications such as Photos.
Does This Update Edge, Photos, Media Player and Other Apps?
Not in the way many people initially assume.
The Windows update integration process primarily services the Windows operating-system image and its components. It does not mean that every Microsoft application will automatically be upgraded to its newest available application version.
For example, Microsoft Store applications such as Photos have their own update mechanism. Microsoft explicitly separates Store application updates from Windows updates.
| Component | Updated by the Windows image servicing process? |
|---|---|
| Windows core operating system | Yes |
| Windows servicing components | Yes |
| Windows Features on Demand | Where applicable |
| Microsoft Store applications | No — separate mechanism |
This means an updated Windows ISO should be thought of as an updated Windows operating-system image, not an ISO containing the newest possible version of every Microsoft application.
What Are All Those Media Player, Paint and Notepad Packages?
During conversion you may see a long list of packages such as:
Microsoft-Windows-MSPaint-FOD-Package
Microsoft-Windows-Notepad-FOD-Package
Microsoft-Windows-Printing-WFS-FOD-Package
Microsoft-Windows-QuickAssist-Package
Microsoft-Windows-WordPad-FOD-Package
These entries can look like application updates, but they are better understood as Windows components and Features on Demand that are being assembled into the Windows image.
Their appearance in the converter does not mean UUP dump is going through Microsoft Store and downloading the newest version of each application.
What Happens Inside the Windows Converter?
Once the UUP files have been downloaded, the Windows converter begins constructing the installation image.
The process creates the setup media layout, builds the install.wim file and then services the Windows images with the selected updates.
In the example, the converter initially reports:
It then starts applying the update packages.
Processing 1 of 1 - Adding package Package_for_RollupFix
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This is where the distinction between the base image and the final build becomes clear.
The converter can start from a base image such as 19041.1 and then integrate the packages required to reach the selected Windows version.
Without integrating the required packages, the ISO can contain the underlying base build rather than the build number selected on UUP dump.
Why Does the Conversion Take So Long?
Downloading the UUP files is only one part of the process.
The converter still has to:
- Prepare the Windows image.
- Create the installation-media layout.
- Build the
install.wimimage. - Mount and service the Windows image.
- Integrate the required updates.
- Perform component cleanup if selected.
- Create the final ISO.
This is why the conversion can continue for quite some time even after all the files have been downloaded.
Image servicing, WIM creation, cleanup and compression can all take considerable time.
Why the Conversion Should Be Done on Windows
For an updated ISO, the Windows conversion process is important because the Windows converter can integrate the required update packages into the image.
UUP dump's FAQ specifically warns that the Linux and macOS conversion scripts do not support installing the updates into the image in the same way.
Therefore, if your objective is an updated Windows installation image, perform the conversion on Windows and keep Include updates enabled.
A Good Configuration for an Updated ISO
| Option | Recommended setting |
|---|---|
| Build type | Feature Update |
| Download method | Download and convert to ISO |
| Include updates | Enabled |
| Run component cleanup | Enabled |
| Integrate .NET Framework 3.5 | Optional |
| Use solid ESD compression | Optional |
What I Would Choose
For a straightforward personal Windows ISO, my configuration would be:
Windows 10 22H2 / Windows 11 build you actually need
Language
Your preferred language
Editions
Home and/or Pro, depending on your requirements
Download method
Download and convert to ISO
Include updates
Enabled
Run component cleanup
Enabled
.NET Framework 3.5
Only if needed
ESD compression
Only if a smaller ISO is worth the additional processing time
Windows 10 22H2 and the 19045.7663 Example
The screenshots in this guide use Windows 10 22H2 build 19045.7663 because it provides a useful real-world example of the UUP process.
Microsoft's August 2026 cumulative update is KB5120249, which brings Windows 10 22H2 to OS Build 19045.7663. The corresponding servicing stack update is KB5104021, version 19041.7546.
It is worth noting that the earlier Cumulative Update selection we initially used was not the best choice for this guide. UUP dump's own documentation recommends selecting the Feature Update when the goal is to create an updated image.
Windows 10 version 22H2 reached its normal end of support on October 14, 2025. The August 2026 19045.7663 update is associated with Microsoft's supported ESU and applicable LTSC servicing channels. Do not interpret the existence of a 19045.7663 UUP build as meaning that ordinary consumer Windows 10 22H2 is still receiving free updates through normal support.
UUP Dump Is Not a Customized Windows Builder
UUP dump should not be confused with tools that create heavily modified Windows images.
Its primary job is to obtain the Windows UUP files and assemble them into installation media. It does not automatically:
- Debloat Windows.
- Remove Microsoft's components.
- Install your third-party applications.
- Apply your personal Windows configuration.
- Update every Microsoft Store application to its newest version.
That simplicity is actually one of its strengths. You are getting a Windows image assembled from Microsoft's own update files rather than a pre-customized ISO downloaded from an unknown third party.
Use the Official UUP Dump Website
There is one security consideration that should not be overlooked.
UUP dump states that its official website is uupdump.net and warns that unofficial copies may use modified or outdated code. The project specifically warns that unofficial copies can potentially be abused to distribute malicious content.
Do not assume that a website offering "UUP dump downloads" is an authorized mirror. If you use UUP dump, go directly to the official uupdump.net website.
The Complete Process at a Glance
2. Choose Windows and the desired build
3. Select the Feature Update entry
4. Choose the language
5. Select the required editions
6. Choose "Download and convert to ISO"
7. Keep "Include updates" enabled
8. Optionally enable component cleanup
9. Optionally integrate .NET Framework 3.5
10. Optionally enable ESD compression
11. Create the download package
12. Run the Windows download/conversion script
13. Wait for the Windows image to be serviced
14. Let the converter finish creating the ISO
Final Thoughts
UUP dump looks complicated at first because it exposes many of the decisions that are normally hidden when you download a ready-made Windows ISO.
Once those decisions are understood, the process becomes fairly straightforward.
The most important thing is choosing the correct build type. If the goal is to create an updated installation image, select the Feature Update, not the Cumulative Update entry. Then select the language and editions you need and use the Download and convert to ISO method.
The other major point is Include updates. An UUP set can contain a base Windows image together with the update packages needed to bring it to the selected build. The converter needs to integrate those updates for the resulting ISO to actually correspond to the build selected on the website.
The Windows converter therefore does considerably more than simply download files and put them into an ISO. It creates the installation layout, builds the Windows image, services it with the appropriate packages, performs cleanup if requested and finally produces the installation media.
That gives you an installation ISO much closer to the Windows build you actually want to install, reducing the amount of updating required immediately after a clean installation.
- Feature Update
- Download and convert to ISO
- Include updates: Enabled
- Run component cleanup: Enabled
- .NET Framework 3.5: Optional
- ESD compression: Optional
Note: UUP dump states that installation images created using its scripts are intended for evaluation purposes and are not supported by Microsoft. Always verify the Windows version, build, architecture, language and edition before creating installation media.