Disregard this; after five tries it worked for some reason.
Sorry for this, but Adobe isn't helpful for me.
I just upgraded to LR2. When I tried to register, it wouldn't accept the serial # from the upgrade cd (I bought it from B&H). When I check the version in 'about lightroom' it shows v. 1.4.

However, the Print Module is installed. When I try to update, it says there are no updates. The Upgrade version is 2.3. any ideas? Am I registered with the previous installation? Isn't there a v. 2.4 now?