Waited a bit, got the email, tried again - Everything worked! I've wanted GooglePro forever - and now I have it - to the point of almost ponying up the $400 of my hard earned money for it.
Registration failed for me with a message suggesting such remedies as trying a different email address. Punched in a gmail address and it worked. Perhaps coincidentally.
http://dl.google.com/earth/client/advanced/current/GoogleEar...
Access to this site is currently restricted