Dear ROUGIER Alexandre, I’m Henry. While I’m unable to reply in your native language, I’ve translated the content to better understand your situation.
I’ve looked into the Windows 11 upgrade failure on the workstation (error 0x000004E5). It seems the issue may be related to a corrupted or invalid user profile. Based on similar discussing thread, one approach that might help is:
- Backup the user’s data from C:\Users<username>.
- Create a new user account on the machine.
- Move the backed-up data into the new profile.
- Optionally, remove the corrupted or duplicate profile.
- Retry the Windows 11 upgrade.
Note: DO NOT copy the entire old user folder. Avoid transferring hidden files and folders like AppData or NTUSER.DAT, as this will copy the corruption and the problem will return. You will need to reconfigure your application settings manually.
Here is another Microsoft guide you can refer: Fix a corrupted user profile - Microsoft Support
Hope this helps