Since you have a Playfirst account, you could try downloading the game and then when it asks for either the registration key or your username and password, you can try the latter instead. Your username and password should work assuming that you bought the game from Playfirst.
Also, if you log in here, you can check to see what purchases you've made and get the unlock keys.
Oh and make sure that if you do enter the activation key, that you entered it exactly. Sometimes it's a matter of missing a letter or number or not capitalizing.
This is a Mac file; it won't install on a PC. Please continue if you plan to save this file and install it elsewhere. Or, cancel to go back and choose another format.
This is a PC file; it won't install on a Mac. Please continue if you plan to save this file and install it elsewhere. Or, cancel to go back and choose another format.
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