There were previously
two topics about this, but I figured I could kill two birds with one stone, here.
As of August 2014, all of our games give both DRM-free versions and Steam keys. However, prior to that, our games gave a variety of things. Regarding older AI War purchases:
1. Older copies of AI War and the first three expansions gave you CD keys, and those were all register-able on Steam.
2. Older copies of Ancient Shadows gave you a CD key, but it can't be registered on Steam. If you want a Steam key for that, just send us an email at arcengames at gmail dot com with some form of proof of purchase (if you bought direct from us, just telling us what email you used is fine).
3. Older copies of Vengeance of the Machine came completely DRM-free, but did not have a Steam or CD key at all. There again, if you want a Steam key for that, just send us an email at arcengames at gmail dot com with some form of proof of purchase (if you bought direct from us, just telling us what email you used is fine).
Thanks!