GamersGateよりきたメールの転載です。

Dear Customer

We hope this note finds you well. Recently, GamersGate started to sell PC and Mac games as one bundled product. If you own one or more of those games that we are offering as a bundle, we’ve made sure that you get the other platform’s version added to your account for free.

For some titles that require serials, you recieved only one. That serial will work for both versions.

Our current PC/Mac bundles can be found at:

http://www.gamersgate.com/all?q=pcmac

Thank you for being a GamersGate customer. We appreciate your loyalty.

Regards

GamersGate Team

PC/Macバンドルで販売しているゲームソフトで片方(Win版かMac版のどちらか)を持っていればもう片方を無料でMyGameリストに追加しておいたよ、という内容です。