How to download Tiny11 ISO for Windows 11 25H2 (preview)

To download the Tiny11 ISO for Windows 11 25H2, first use the UUP Dump tool to get the latest Insider Preview ISO for the operating system.
Then, you need to use the Tiny11 Builder script to remove unwanted apps, such as Edge, OneDrive, and Xbox, and set up a local account.
This process creates a custom, debloated Windows 11 ISO ready for a clean install.

If you want a clean installation of Windows 11 25H2 without bloatware and with support for a local account, you can use Tiny11 Builder to create a custom ISO file stripped of unnecessary apps and features. In this guide, you’ll learn the steps to build a debloated installation media using this tool.

What is Tiny11 Builder?

“Tiny11 Builder” is a third-party script developed by the community user @NTDEV_, designed to customize and streamline Windows 11 installation media. It modifies a base Windows 11 ISO to remove most default apps and services, making the system lighter, faster, and less cluttered.

The tool can automatically remove apps, such as Clipchamp, News, Weather, Xbox, Get Help, Media Player, Quick Assist, OneDrive, and even Microsoft Edge. In addition to app removal, the tool includes an unattended answer file that allows you to bypass the Microsoft account requirement and create a local account during setup. It also uses the “compact” deployment flag to reduce the size of the final installation.

Why use Tiny11 Builder?

Windows 11 has steadily been adding more features and preinstalled apps with each update, many of which aren’t essential for every user. Tiny11 Builder gives you full control to create a customized and slimmed-down version of the operating system tailored to your specific needs.

It’s ideal for advanced users who prefer local accounts, minimal installations for performance or testing, virtual machines, or older hardware setups, and for those with privacy concerns.

The last update of Tiny11 Builder was in November 2024, and official support is available up to version 24H2. However, since version 24H2 and 25H2 share the core system, you can still use the tool to create an installation media for the next feature update.

Why use UUP Dump to get Windows 11 25H2?

Since version 25H2 won’t be officially released until Fall 2025 (likely October), you’ll need to use the UUP Dump tool to get the latest Insider Preview build. UUP Dump is an open-source script that pulls official files directly from Microsoft’s update servers and builds a clean ISO from them.

In this guide, I will teach you the steps to download and create a Tiny11 ISO for Windows 11 25H2.

Important: Since the Windows 11 2025 Update is still under development, please note that features, changes, and fixes may not function as expected, and you may encounter issues, including data loss. It’s recommended to create a backup of your computer before installing this version. You have been warned.

Create a debloated Windows 11 25H2 ISO using Tiny11 Builder

To download and create a Windows 11 25H2 ISO file using the Tiny11 Builder and UUP Dump scripts, follow these steps:

Open the UUP Dump page.
Click the Downloads tab.
Select the “Windows 11 Insider Preview” option to download the latest (x64) ISO file, for example, build 26200.5702.

Quick tip: In the case of version 25H2, always choose a build equal to or higher than 26200.5702. If you have a Copilot+ PC or a device using an ARM processor, then download the “arm64” architecture.
Select the language for the installation in the “Language” setting.
Click the Next button.
Select the version 25H2 editions to include in the Windows 11 ISO file.
Click the Next button.
Select the “Download and convert to ISO” option.
Check the “Include updates (Windows converter only)” option.

Quick note: This step enables the script to integrate the updates, resulting in an ISO file version 25H2. As a result of this option, the process of creating the ISO file can take approximately an hour.
Click the “Create download package” button to save the tool on your computer.
Open the zip folder with File Explorer.
Click the Extract all button.
Select the location where you want to extract the files.
Click the Extract button.
Right-click the “uup_download_windows.cmd” batch file and select the Run as administrator option.
Click the More info option.
Click the “Run anyway” button to begin the lengthy process.
Press the “R” key to run the script once, and then press the Enter key.
Press the 0 key when prompted to close the screen.
Open the Tiny11Builder GitHub page.
Click the latest zip file available under the “Assets” section.
Save the file containing the script on your device.
Open the folder location.
Select the Tiny11Builder-main-zip file.
Click the Extract all button.
Click the Extract button.
Open File Explorer.
Open the Windows 11 25H2 ISO folder location.
Right-click the ISO file and select the “Mount” option.
Confirm the drive letter of the virtual drive where the ISO is mounted.
Open Start.
Search for PowerShell, right-click the top result, and choose the Run as administrator option.
Type the following command to allow the Tiny11Builder script to run on the computer and press Enter:
```
Set-ExecutionPolicy unrestricted
```
Type the following command to run the Tiny11Builder script and press Enter:
```
& "C:\PATH\TO\SCRIPT\tiny11maker.ps1"
```
Quick tip: The folder includes two scripts, the “tiny11maker.ps1” that removes most default apps (recommended), and then there is the “tiny11Coremaker.ps1” script that debloats the operating system and removes Store components, disables Microsoft Defender Antivirus, and turns off the Windows Update system.
Type “R” and press Enter.
Confirm the drive letter of the Windows 11 mount point and press Enter.
Confirm the index number for the edition of the operating system to create the image and press Enter.

Quick note: Since we’re using the UUP Dump script, you may only see one or two index options, whereas the official ISO file typically includes all editions of the operating system.
Press Enter to complete the process and exit the script.
Type the following command to set the more secure PowerShell execution policy and press Enter:
```
Set-ExecutionPolicy Restricted
```

Once you complete the steps, the script will create a custom ISO file that you can use to perform a truly clean installation of Windows 11 25H2.

If you encounter an issue while running the UUP Dump script during the first part of these instructions, within the script folder, right-click the “Remove_Failure_MountDr_TempDir.cmd” file and choose the “Run as administrator” option. After the process completes, run UUP Dump one more time.

Also, ensure that your device has enough space to allow the script to process the files to avoid issues and delays. Typically, the computer requires approximately 70 GB of free space on the primary drive.

Once you have the ISO file, you can mount it in a virtual machine or use tools like Rufus and Ventoy to create a bootable USB media.

If you’re wondering why there’s no direct download link for the ISO file, it’s due to two reasons. First, version 25H2 is not yet available in its final form. Second, the developer created the script to be more transparent, as anyone can tamper with an ISO file. Using the script, you can be sure that nothing extra is being added or modified. You can always open and review the script before using it.