Need help getting FM2012 to work on my computer

Grimezy

Prolific Poster
So my brother bought Football Manager 2012 on disc a while ago and recently I've been thinking about playing it as he's finished with it and I'd like to give it a go before I spend 20 quid on FM2013. It's uninstalled from his computer but is obviously still there as a purchase in his Steam library. Is there anyway I can deactivate it from his account and use it on mine? I assume there won't be and that I'll have to purchase a new key...

Which brings me onto my next point, does anybody know where I could pick up a cheap key from? Nowhere really seems to have them anymore and the places that do are charging a ridiculous price that I might as well just buy 2013.
 
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