It is acutally lso available via Desura
Pathologic is no easy game. It's not hard balls Dark Souls sort of thing, more like you are forced all the time to make meaningful choices, I think the article explains it better than I could.
I got interested in the game due to Rock Paper Shotgun making a series of articles in regards to the game. I would try to elaborate on that, but it is a fruitless endeavour. Both RPGS and HG101 certainly hit the nail on the head talking about it.
I haven't been able to finish it to be honest, been a while since I did. I managed to die by the second day on my first Haruspicus run, i forgot why. Game is not fun in a traditional sense, you won't feel any sense of joy, but it remains incredibly compelling in spite of everything. It definitely is worth at least trying it out - game's old enough it will run in plenty of setups and cheap enough as well.
The only recommendation I can do to you in a technical sense I tweak the FoV, because indoors is horrid. That's my only complain.