I freely admit I wiped my N7 (2013) and went directly to the downloadable 5.0.1 factory image. I just don't trust OTA updates for anything other than updates within the same major release number. Been stuck with those "boat anchors" too often to mess around any more.
Booting to recovery and wiping the cache partition (keeps all user data) is always wise after an update, too.
But I've got "starting over" down to a science!
I'd actually forgotten about CC this time around, though.
Was ecstatic to find out it installed and worked with no issues.