Assuming this is not a beta release, but has been available on Steam for awhile (at least the 0.5 major update).

Note: GOG seems to not have gotten 0.4.1, 0.5 or 0.5.1. We're stuck at 0.4

Yes, when the heck are we getting the 0.5.1 patch ??

still waiting for 0.5.1 patch .......... ?????