I've been stuck in 92% for almost an hour, if I restart GOG it goes back to 90% takes some time to reach to 92% again so I won't do it again, actually I do have sometime waiting for a 93% but doesn't happen, I don't know what's going on or how to fix it, tried pausing and resuming the download, nothing seems to work. EDIT (Probably a solution for you too):
So basically as I said before, i was stuck at 92%, tired of this i tried opening the game (clicking on Play) although I knew it wasn't going to work, I got the "Go back to sleep Samurai" screen and insta closed the game, right after that, almost inmediatly it jumped from 92% to 100%, and started downloading a 241MB patch, lasted less than one minute, and now i'm ready to play.
So just hit play and close the "Go back to sleep Samurai"-window as soon as it opens. Right??