Hi there
I'm not with Laminar Research, just a fellow simmer in the UK, but a couple of questions:-
1. Are you trying to download XP11 via the Installer app, directly from the LR website, or some other third party website?
2. Have you got DVD Disc No 1 in the DVD ROM drive at all times, as this needs to be accessible by XP11 for it to run and/or update?
Regards