First of all--I just did my trial too and it blew me away, so I think you're in for a treat. Also nice to see you over in these forums, Jeff!
Anyway now to make myself useful: click on "User Area" in the top menu, then click "Personal Files" on the left, then "Software" at the top, then "Vienna MIR" on the left. If this is your first Vienna product you may need to download the Download Manager too, which is also available on the menu on the left.
I think VSL's site is well-organized enough for people who are familiar, but I believe the user experience for people who don't use their software all the time is very confusing and I'd encourage the team to think of an easier start for new users! Anyway I hope this is helpful!
Edit--I think this is self-explanatory, but you also need to download a RoomPack, so get a second trial of whichever RoomPack you prefer out of the four options (great orchestral halls in RoomPack 1, studio and scoring stages in 2, a bit of both in 4, and crazy beautiful churches in 3.) The RoomPack download then becomes available in the same "Software" section, but after clicking "MIR RoomPacks" on the left.