Offline installer for .net 3.5 sp1 not working

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http://serverfault.com – I download a big file of .Net 3.5 SP1 from http://download.microsoft.com/download/2/0/e/20e90413-712f-438c-988e-fda... Now when I try to install it on Windows Server 2012, I get the following screenshot: What the?? When will the microsoft learn? Now this is a loop. When I try to install from Server Manager, I get installation cannot be done. It needs installation disk. Does that mean I can't install at all without the installation disk in presence? (HowTos)