Is it possible to play adrenaline gamer without steam?

As far as I know the AG 6.6 release version should work with non-steam clients, however stuff like OpenAG will not work.

If you want to play in multiplayer servers that will be more tricky as the server has to be patched to allow non-steam clients, there are only a couple that support it.

Thanks for the answer. I installed the AG 6.6 version in the half-life folder, but there is no exe I can run in half-life/ag. Normally, this exe was on steam. So what can I do in this situation?