Hopefully this helps you...
I had problems installing from Physical Disc (didn't try download) but Disc 1 would freeze at 17% all the time and get no further, no activity on the DVD.
I decided to rip the DVDs to ISOs (I do that for a backup anyway incase the kids get their hands on them). I then installed from the ISOs and it worked fine. Software I used was IsoRecorder and Daemon Tools light. You may need AnyDVD too but not sure - it runs on my PC by default so haven't tried without it.
When installing from the ISOs mounted in Daemon Tools it cruised passed 17% no probs - game installed now.
Good luck
