yyahoo: I guess I'm missing some backstory. Was it listed as free for a while?
IAmSinistar: Apparently it appeared on some folks' shelves, but without any downloadable content. So this led to speculation that it was a free add-on. GOG has reported having a number of problems adding it to the system, to the point where they needed to code a special solution for it, so its final form is still a mystery.
I'm holding off on buying it for now, in case it is meant to be free. Also, a purchase now while it's in flux is a bad idea.
Ah, that makes sense. This whole DLC thing has been somewhat of a nightmare for GOG, particularly with SOTS. I don't know how it is now, but there was a time that unless you followed a very particular instruction set when installing all of the DLC, the game would not work properly...