As topic - I read on these forums that GoG's version of Alien Shooter 1 was the "revisited" version, but how can you tell? The store page doesn't say anything about this being the revisted version or not, and the game screen doesn't say "revisited" on it. So can anyone tell me, which version of Alien Shooter one is GoG selling?

It is not the Revisited version, it is the original Alien Shooter plus expansions just as the store page describes it. Check out the game screenshots on the GOG page and compare them to the Revisitied version screenshots on the Sigma Team website - you'll see they are quite different.