Hi just wondering if anyone had experience with this. Parallels 9 is being released tomorrow (9/5) and I was wondering if I bought Parallels 8 today and got the free upgrade tomorrow, I'd be able to give my sister the original parallels 8 activation key to use on her older MBA with Win7 while I upgrade to the new version. Do they deactivate the old key once you upgrade to the new version? TIA