This is from AI respond.
When the "Keep personal files and apps" option is greyed out during an in-place upgrade, it is usually because the installer has detected a mismatch between your current Windows installation and the installation media (ISO/Assistant) you are using. [1, 2]
## Common Causes & Fixes
* Language Mismatch: This is the most frequent cause. If your current Windows is set to English (United States) but your ISO is English (International), the option will be disabled.
* Fix: Check your language in Settings > Time & Language > Language & region and download a matching ISO from the Official Microsoft Download Page.
* Edition Mismatch: You cannot keep files if you are changing editions, such as trying to "upgrade" from Pro to Home or using an Enterprise ISO on a Pro machine.
* Fix: Use winver (Win + R > type winver) to confirm your current edition and ensure your installation media matches exactly.
* Wrong Installation Method: If you boot from a USB drive/DVD to start the upgrade, Windows often forces a clean install.
* Fix: Run the upgrade from within Windows. Right-click your ISO, select Mount, and run setup.exe directly from the virtual drive.
* Registry Redirects: If you have manually changed the location of your "Program Files" or "Users" folders via the registry, the installer will block the upgrade.
* Fix: Revert these registry keys to their default C: drive paths before attempting the upgrade.
* Evaluation Media (Server Only): If you are upgrading a Windows Server, you cannot keep files if you are using Evaluation media. You must use a retail or volume license ISO. [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
## Quick Troubleshooting Steps
1. Run Repairs: Open Command Prompt as Administrator and run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth to fix corrupted system files that might be blocking the installer.
2. Match Architecture: Ensure you aren't trying to install a 64-bit version over a 32-bit version (or vice versa).
3. Check for Updates: Ensure all pending Windows Updates are installed on your current OS before starting the upgrade. [2, 3, 6, 11]
Would you like the specific registry paths to check for folder redirection or help identifying your exact language code?
[1] [https://techcommunity.microsoft.com](https://techcommunity.microsoft.com/discussions/windows11/why-keep-personal-files-and-apps-option-greyed-out-during-windows-11-upgrade/4427815)
[2] [https://learn.microsoft.com](https://learn.microsoft.com/en-gb/answers/questions/5743131/in-place-upgrade-of-windows-server)
[3] [https://www.reddit.com](https://www.reddit.com/r/WindowsHelp/comments/1mxk45c/windows_11_in_place_upgrade_greyed_out_option_to/)
[4] [https://www.youtube.com](https://www.youtube.com/watch?v=zhvRPn481_Q)
[5] [https://www.youtube.com](https://www.youtube.com/watch?v=WlMjgNst3Tk)
[6] [https://techcommunity.microsoft.com](https://techcommunity.microsoft.com/discussions/windows10space/why-keep-files-and-apps-option-greyed-out-when-upgrading-to-windows-11/4462706)
[7] [https://learn.microsoft.com](https://learn.microsoft.com/en-us/answers/questions/4258207/keep-personal-files-and-apps-greyed-out)
[8] [https://learn.microsoft.com](https://learn.microsoft.com/en-sg/answers/questions/2187047/keep-personal-files-and-apps-option-greyed-out-whe)
[9] [https://www.dell.com](https://www.dell.com/support/kbdoc/en-us/000345922/windows-server-cannot-keep-files-and-settings-during-in-place-upgrade)
[10] [https://learn.microsoft.com](https://learn.microsoft.com/en-us/answers/questions/1435810/problem-upgrade-in-place-winsrv2016-to-winsrv2022)
[11] [https://community.spiceworks.com](https://community.spiceworks.com/t/inplace-upgrade-keep-personal-files-and-apps-greyed-out-winsrv16-essentials-to-winsrv25-essentials/1182688)