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To Aerthen Steam Key: Official PC Key, Instant Delivery

Yes. Every To Aerthen key we sell comes from a distributor authorized by the publisher.
Open Steam, click Games, choose "Activate a Product on Steam", then paste your key. To Aerthen is added to your Steam library right away.
Some keys only work in certain regions. This page shows where this To Aerthen key can be activated before you buy.