This is using MS Windows 2012 r2 server. Dot net framework 4.0 is setup by the developer. However, they also demand dot net framework 3.5 to be install. So, I went to the server manager > roles and features, and then follow the wizard with attempt to get it installed. The setup failed even I select to point the source to the w2k12 r2 cd, why?
Thanks in advance.