I had the Beta .exe installed earlier, but it didn't give me any place to enter my key nor would it let me make a new account. I figured I'd try to uninstall then re-install but now every time the installer tries to download the game I just get a repeating note that says "Connection Failure" even though my internet is fine.

Never mind about the not downloading, it just seems that I had duplicate installers and when I deleted both and downloaded a fresh one it worked.