If you haven't already, you should map a drive to
\\monolith.scs.ad.cs.cmu.edu\pc_dist. You can do that by following these
steps:

   Go to Start ->  Computer
   Right-click Computer and select Map Network Drive
   Select whatever drive letter you'd like and enter the following value in
the Folder field:
          \\monolith.scs.ad.cs.cmu.edu\pc_dist
   Click Finish

If prompted, you should use your SCS username (SCS\roboman) and your SCS
Windows password.

From there, use Windows Explorer to open the drive you mapped to
\\monolith.scs.ad.cs.cmu.edu\pc_dist and  browse the folders to solidworks
-> solidworks -> 2012 and copy the SolidWorksSetup executable to your
computer and double-click it to start the installation process.

There is a ReadMe file in that folder that includes the license 
information for SolidWorks 2012.