Hi @A. Karaulli ,
Try the following solutions.
Open Settings > Update & Security > Troubleshoot. Click on Additional troubleshooters. Select Windows Update and run the troubleshooter.
- Download the .NET Framework 3.5 Offline Installer from Microsoft's official site. Install it manually using this command in Command Prompt (Admin):
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:X:\sources\sxs
*(Replace X:** with your Windows installation media drive letter).