Did you try disabling anti-virus all together just to see if that worked? Do you see any files in the /temp/ folder?
Try downloading these somewhere on your machine.
https://recursiontracker.com/fist/MI...TSTUpdater.exe
https://recursiontracker.com/fist/0L...STElevated.exe
https://recursiontracker.com/fist/bh.../RTLibrary.dll
Do they download? (don't replace the existing files with these)