UPDATED 11/26/2025: You can technically download the ISO file for any preview build of Windows 11 (such as build 2800.1199 and 26220.7271) available in the Canary or other channels, such as Dev, Beta, or Release Preview. You only need to use a third-party tool, such as “UUP Dump.”
Although Microsoft makes the Windows 11 ISO available for previews, allowing users to test the clean installation and in-place upgrade processes on virtual machines and spare computers, this isn’t always the case.
UUP Dump is a tool that lets you create a custom Windows 11 ISO from any public preview. It is a script that downloads the latest builds from Microsoft servers and creates an unofficial ISO file you can use to install the operating system.
In this guide, I will walk you through the steps to use the UUP Dump tool to download the ISO file for any publicly available Windows 11 preview.
Download any Windows 11 preview ISO file using UUP Dump
To download the Windows 11 ISO file for any Insider Preview build (such as build 2800.1199), use these steps:
-
Quick tip: Alternatively, if the site is down, you can try (at your own risk) using the https://uup.rg-adguard.net/ page.
-
Click the Downloads tab.
-
Select the operating system channel or release (25H2, 24H2, or 23H2) from the “Windows 11” menu.
-
Select the “Windows 11 Insider Preview” to download the latest (x64) ISO file – for example, build 2800.1199 in the Canary Channel and 26220.7271 in the Dev and Beta Channels.
-
Use the “Language” drop-down menu to select the language for the installation.
-
Click the Next button.
-
Select the editions to include in the Windows 11 ISO file.
-
Click the Next button.
-
Select the “Download and convert to ISO” option.
-
Under the “Conversion options” section, clear all the options. (These options will increase the time to complete the ISO creation.)
-
Click the “Create download package” button to save the tool on your device.
-
Open the zip folder with File Explorer.
-
Click the Extract all button.
-
Select the location 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 Enter.
-
Press the 0 key when prompted to close the screen.
Once you complete the steps, the Windows 11 ISO file will be created inside the folder where you extracted the UUP Dump tool. You can now use the ISO file to upgrade a testing virtual machine to the latest preview of Windows 11. Alternatively, you can use third-party tools like Rufus to create a USB media to install the operating system on a spare computer.
Mauro Huculak is a Windows How-To Expert and founder of Pureinfotech in 2010. With over 22 years as a technology writer and IT Specialist, Mauro specializes in Windows, software, and cross-platform systems such as Linux, Android, and macOS.
Certifications: Microsoft Certified Solutions Associate (MCSA), Cisco Certified Network Professional (CCNP), VMware Certified Professional (VCP), and CompTIA A+ and Network+.
Mauro is a recognized Microsoft MVP and has also been a long-time contributor to Windows Central.
You can follow him on YouTube, Threads, BlueSky, X (Twitter), LinkedIn and About.me. Email him at [email protected].