You have .NET 2.0. You need to install latest .NET framework 4.5.
Ok, thanks. I have version 4.5 installed, but somehow it launches with 2.0. I think error is on my side, so I'll try to reinstall framework.
Anyway, I guess required framework version should be mentioned on the first page.
on windows 8 I have often encountered an error where .net 4.5 was installed but not enabled. Try to Google "hot to enable .net 4.5". The answers there usually fixed my problem.