Good to know. Well, fail #1.. "Signature failed" .. I had grabbed it off HTC's server last night before it was removed. I am in a hotel, and it was taking forever over wireless, so plugged in the wired connection and disabled wireless.. maybe that slightly corrupted the file. It opens fine with no error with WinRar.. shrug.
Renamed to update.zip like suggested, but failed the check when I went to apply.
Re-downloading from somewhere.. lol
EDIT: helps when you don't mistakenly drag it into the wrong folder... :\ heh... Also noticed, when I had the update.zip in the root folder, there were Android robots at the bottom of the first screen.. the first 2 attempts (when update.zip was in wrong folder), there were no robots on the first screen. No big deal, just thought was interesting. Looks like it's working now.