Offline installer for .Net 3.5 SP1 not working

Question

I downloaded a big file of .Net 3.5 SP1.

Now when I try to install it on Windows Server 2012, I get the following screenshot:

Answer 1

Your WSUS server is probobly getting in the way, or you just can't reach the Microsoft update site.

Follow these directions. "Specify settings for optional component installation and component repair" worked for me.