The reason the licence key purchased for re-sell outlets is that they keys was obtained illegally and have been blocked by MS. If you wish to update someone's computer you should do it properly. Updating with a pirated key is not doing them any favours at all.
If you are looking for ways of installing pirated software forget it; you have come to the wrong place for that. We don't do piracy, hacking or any other illegal activity.
It doesn't matter how altruistic your may be, if you want to install anything more advanced than Windows 98, you need a licence.