That aside, there's a very good reason why this game doesn't have a demo available, resources. As in, Larian doesn't have the resources available to them to make/update the game and work on a demo. They're a small studio, and so they have to prioritize on fixing the bugs before they can dedicate time/money to a demo. Perhaps they'll release a demo version once they get the majority of the patches sorted out, but I'd wager that won't be for a while.
Its tricky, when most companies can't be bothered to release demos anymore - be they large or small, then I have less issue with people torrenting to try them first. Its all well and good people saying "well you can watch a youtube / twitch stream to see what you think of the game" and it will give you some idea of what the game is like but it won't tell you how the game will perform on _your_ computer and how you get on with the controls or the interface, which are important things to know.
Its particularly annoying when many Xbox 360 games have demos, and certainly everything available in the Xbox Arcade has a trial version that you can test out.
A good option, now that GOG do it though Steam don't yet, is that GOG will do an unconditional refund within 30 days. So one could buy it there, test it and if things don\t work out as you'd like then you can get a refund rather than running the risk that you get caught downloading a torrent or get a torrent infected with a virus.