Edit: I have isolated the files containing the missing cutscenes, from when you complete the puzzle to "waking up in a room with edgar" they are contained at the end of my playthrough here: http://youtu.be/zYzzKiaMocU?t=31m
(it will already skip to where the cutscene is in the video, you don't have to go through the playthrough to find it)
I am sad to be writing a negative review for this game, but first I will give it the praise that it is due.
It is a very enjoyable game to play, classic point-and-click with a wonderfully creepy atmosphere. The puzzles are challenging, and interesting. It is a great hommage to the style of lovecraft stories, and very enjoyable to play. It is certainly worth playing, and I'm glad that I have done so. I do think it's important to note this.
That being said, the game is incompletable. As others has said there is a massive, leathal bug. A very large, and important cutscene, one that shapes the entire game, and gives the player direction in what to do next (as well as a huge part of the story, and reward for completing the puzzle which came before it) is missing. Also inventory issues, and not being able to access some items leaves the game incompletable from very close to the end.
I do understand that meridian have offered their 'solution' which is to download a save game - which means still missing out on that long cutscene, as well as not completing a puzzle. Now that is no solution at all, it's basically a 'level skip cheat' It seems to be as though the developers really do not care about fixing this for the players.
It's an honest shame, because while the game is enjoyable - I would really not recommend anyone buying it. At least not until the developers actually care enough to fix this bug - and it is a bug no matter how much they want to deny that.
tl;dr: Don't buy this game until they have fixed the MAJOR errors in it.
Otherwise is really is a great game.