Hi Serge RUMEAU,
Welcome to Microsoft Community.
Based on the original description, the device seems to be experiencing issues related to the NET Framework.
The message you are encountering seems to indicate that the device cannot find/locate a specific file, which may be related to a variety of factors, including but not limited to corrupted files, missing prerequisites, corrupted registry entries, and corrupted profiles.
Content in this link described an example of tools related to application installation issues.
Program Install and Uninstall troubleshooter
If this is the system's automatic installation behavior, you can try to manually install the specific patch with the specific number.
Microsoft .Net Framework 4.8 Will Not Install - Microsoft Community
If this is a problem you encounter during manual installation, according to information in a thread containing similar problems, the NET Framework Repair Tool is a step to try.
.NET Framework 4.8 on Windows Server 2019 - installation failes - Microsoft Q&A
Sometimes, a damaged profile can cause some strange problems.
If possible, you can try to observe whether the behavior is the same under a new local account.
How to create a Local account in Windows 11 - Microsoft Community
If I misunderstand your situation, feel free to correct me and share the information.
Best Regards,
Kyo.Y - MSFT | Microsoft Community Technical Support