Dism /online /enable-feature /featurename:NetFx3 /Source:X:\sources\sxs /all /LimitAccess
You can try:
- Delete everything under: C:\Windows\SoftwareDistribution\Download
Those are left over from Windows Updates and no longer needed.- From Admin Command prompt, run:
Dism /Online /Cleanup-Image /StartComponentCleanup- Turn on Net Framework 3.5 from programs & Features again to see if it helps.
Or
choco install dotnet3.5