Hi. I was lucky enough to be one among my local Game Coop to receive an extended Pro License for Unity+ addons (lasts till 1/1/12) However, this same license key was given to all the members, and it has a fixed number of activations. Unfortunately, in the near future, I will probably have to do a system wipe on my main dev machine. Since all of the activations are used up, is there a way to preserve my existing activation, or will I lose this entirely?
if its the same machine just wiped it will just reactivate normally without a problem.
otherwise you will need to talk to the support about it as they grented this special license 
Yeah, it will be the same machine. My main concern was how the activation system will react to requesting an activation of a key that’s been consumed. I don’t want to make a big issue out of potentially nothing, I just want to preemptively do all I can before crying for help. 
you can always go to your user folder, app data and then I think its locallow where you find the pace folder from where you can backup the hardware license for this one machine
then you are save