I have 8.1 Pro running and its activated with a leaked retail key. If i buy WMC upgrade key, will that new key work for re-installing 8.1 fresh in the future? Or could i make a 8.1 Pro WMC ISO that will install with the WMC key? Would it then be "legit"?. If thats not how it works, i apologise for asking a stupid question! hah.