I got an eMail that said a new Map Disc was available for my 2012 CTS ($40 off). OK, I bought it ($160 plus tax) and it arrived yesterday. Package included a EULA and a Disc. Front of disc says "read the manual carefully". No manual in the package. OK, so how do I get a manual to read or what do I do with the Disc. I assume I just put it in the car and it should do the update, but I wanted to make sure. I put the disc in my computer and looked at the files but nothing on the disc looked like a manual.