I actually recently had trouble with this, nigh but yesterday (and the entire week before). My problem was that it'd install PLAY, but not the library, even after all activation required. What I did was uninstall PLAY, restart, deactivate the User Account Control, restarted again for good measure, and then just kept on trying until it worked. Tedious, yes, but it ended up working. Might I just say that the library sounds utterly fantastic.Eventually it should download everything off of Disc 1, then ask for each consecutive disk and then you're done. Good luck, and hope that helped!