The listing, [GIN 2000][DLC only, without game][PC] Defense Grid 2 Double-Take Designer’s Cut [Steam Key] has ended.
This is Steam code for Double-Take: The Designer's Cut
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About steam: https://en.wikipedia.org/wiki/Steam_(software)
Download Steam Client: http://media.steampowered.com/client/installer/SteamSetup.exe
How to activate Steam Keys/DLC-keys/CD-Keys: https://support.steampowered.com/kb_article.php?ref=5414-TFBN-1352&l=english
Important: This is DLC Steam Key for PC version. You can activate this key with DLC only once by using Steam Client. For activation this DLC you must have this game http://store.steampowered.com/app/221540 in your library. Steam DLC key for this game will be delivered to the winner of auction on listia private message (usually, listia sent to you email when you get private message, so you will be notices about key anyway).
Note: Please, don't forget to write positive feedback on my page after getting Key! You will get this game for cheap price anyway, so positive feedback is a good opportunity to support my listias in a future!