Situatie
In windows 10, go to the search tab and type “Group Policy” and open the first result.
Once in the Greoup Policy window, open “Administrative Templates>System” and open “Specify settings for optional component installation and component repair”.
Change the policy as shown in the picture below:
Click on “Apply” and “Ok” and try installing .net 3.5 again, it will work as intended now. This workaround is useful if your local network does not allow a connection to the Microsoft WSUS servers or your organisation has a local WSUS server.
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