Rebuilt my system last night on some SSD’s and this would be the second rebuild so I’ve already activated Unity 2 times before, I’ve sent in an email support request however if any Unity Staff are looking online I’d appreciate any help you could offer this weekend 
Thanks!!
Same here - my computer is dying… before it completely gave up the ghost, I got a new system up and running and moved all my projects to it. Now I need to deactivate and reactivate - emailed support yesterday, but being the holiday weekend, I’m guessing it’ll be Tuesday before I can reactivate?
I wish there was a way to manually deactivate an install to free up a slot…
I agree. I change my hardware configuration all the time (kind of a hardware enthusiast), and Unity Pro is a main tool at work. I should be able to manage my keys through Unity’s website or something.