Alright, I've been following the pre-install instructions. Uninstalled the D3 Beta, downloaded the Blizzard downloader, waited while the installer downloaded the 7.60GBs of install files onto my local hard drive. That completed, the installer ran and I said "Install Now", "Yes I agree" and now it's on the normal download / update client, and it's stuck on "Installing" with the progress bar at 1%.
I've seen several people say to just wait (waiting for 1+ hour as of now, no change), and I haven't seen any specific error codes. The installer is running as administrator (Launched by the downloader) and there's a "Diablo III.temp" folder in my program files folder that the installer appears to have created. I did try canceling the installer, deleting that folder, and re-running the installer, but again, I'm still having the same issue.
In addition, installer also doesn't have any of the "Connection Information" "Downloader Preferences" menu options enabled...
Anybody have any ideas?