UPDATED 9/18/2023: You can technically download the ISO file for any preview build of Windows 11 (such as build 25951 and 23545) available in the Canary or other channels. You only need to use a third-party tool like “UUP Dump.”
Although Microsoft makes available the ISO file for previews of Windows 11 to allow users to test the clean installation and in-place upgrade process on virtual machines and spare computers, it’s not always the case.
UUP Dump is a tool that allows you to create a custom Windows 11 ISO file from any public preview. The tool is a collection of other tools and scripts to download the latest builds from the Microsoft servers and create an unofficial ISO file that you can use to install the OS.
In this guide, you will learn the steps to use the UUP Dump tool to download the ISO file for any publicly available preview of Windows 11.
Download Windows 11 build 25951 ISO file using UUP Dump
To download the Windows 11 ISO file for any Insider Preview build (such as build 25951 or 23440), use these steps:
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Quick tip: Alternatively, if the site is down, you can try (at your own risk) using the https://uup.rg-adguard.net/ page.
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Click the Downloads tab.
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Select the “Windows 11 Insider Preview” to download the latest (x64) ISO file – for example, build 25951 or 23545.
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Use the “Language” drop-down menu to select the installation language.
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Click the Next button.
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Select the editions to include in the Windows 11 ISO file.
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Click the Next button.
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Select the “Download and convert to ISO” option.
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Under the “Conversion options” section, clear all the options. (These options will increase the time to complete the ISO creation.)
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Click the “Create download package” button to save the tool on your device.
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Open the zip folder with File Explorer.
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Click the Extract all button.
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Select the location to extract the files.
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Click the Extract button.
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Right-click the uup_download_windows.cmd batch file and select the Run as administrator option.
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Click the More info option.
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Click the Run anyway button to begin the long process.
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Press the “R” key to allow the script to run once, and press Enter.
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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 expert and the Editor-in-Chief who started Pureinfotech in 2010 as an independent online publication. He is also been a Windows Central contributor for nearly a decade. Mauro has over 12 years of experience writing comprehensive guides and creating professional videos about Windows, software, and related technologies, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 20 years of combined experience in technology. Throughout his career, he achieved different professional certifications from Microsoft (MSCA), Cisco (CCNP), VMware (VCP), and CompTIA (A+ and Network+), and he has been recognized as a Microsoft MVP for many years. You can follow him on X (Twitter), YouTube, LinkedIn and About.me.