I wiped my desktop PC hard drive and installed Win 8.1. My PC runs fine. I downloaded and installed LR 4 with no problem. Activation is the issue.
I bought LR 1.1 and have upgraded to each version including LR 4 in the past. I used the same desktop PC to run those versions of LR (and have changed the OS with no problems). I tried to use the serial numbers from the previous versions of LR to activate LR 4, but no success. I am running the same purchased LR 4 on my laptop with no problem.
What do I do to re-activate LR 4 on my desktop PC?