I have 2 laptops that I clean-installed Windows 8.1 Pro with a CD-key, and they are both unactivated. I just got a job working at an electronics store that sells Windows 8.1 Pro & Core Editions, and I get a discount (not sure how much). If I buy Core Edition, will I be able to enter the keys and activate, or do I need to switch the CD-key somehow to Core Edition first before activating? Also, will I be able to activate the second laptop with the same key? I was able to get away with this with Windows 7. I had to do the phone activation for the second laptop, but both stayed genuine for as long as I had them.