installing

I manage the mods for me and my girlfriend, and the first time installing everything worked flawlessly (that was like 4 months ago). Now I wanted to update to the newest version of SMAPI 3.18.3 and SMAPI won't install, giving out a DotNet error in the cmd window. I only have this photo of the...

So I tried installing Smapi today but I can't get it to work, I keep getting this error The installer failed with an unexpected exception. If you need help fixing this error, see https://smapi.io/help System.UnauthorizedAccessException: Access to the path 'C:\Program...