Maybe you should have extracted the archive first and then run the exe. Many Programs will create folders and such and they cannot do that if you run them from within an archive.

Also maybe this video might help you out: https://www.youtube.com/watch?v=kQtst8G2ARg

At around 4:19 he will install .net 4.5 and then downloads, extracts and installs the autoupdater.

The video is in german, but from the things he does you should get a clue on what to do and where things went wrong for you.

Good Luck mate!