I would personally test this but, the last time I installed Crimson drivers I had to wait 25 minutes. I don't feel like reverting to an older beta just to see what the device manager says just to wait another 25 minutes to install the stupid drivers again.
Edit: I'm not saying all beta drivers are WHQL signed, I'm saying that
some of them might be judging from what others have said on the forums. Once again, it requires investigation and I don't know for a fact myself.
Edit 2:
@RCoon said it auto updated him to latest drivers. Here is the quote from the 15.11.1 thread.