Luckily I always save what I download, but I still always feel compelled to check if everything is up to date and wind up downloading again.
But yeah, it's a pain. Usually only takes 1 evening, but there's a bit of pressure behind the ordeal because you're constantly installing and rebooting. I recently did some maintenance and got that dual-boot working; a friend of mine comes on Skype and asks "what the hell are you doing?!", because he constantly got the pop-up of me logging in after a reboot.
Don't know if you can keep going, but I'd do a fresh install anyway. They probably made some changes going from RC to release. Not sure they can just patch those in.
