I couldn't find a zip or rar download, either. It's a 367 MB file with 1472 pieces. I seed the file whenever I can and there are 12 seeders as I look now. As more people download the file and seed it, it should get better.
There's a nice YouTube tutorial video on using uTorrent for anyone who hasn't yet been exposed to that world:
http://www.youtube.com/watch?v=7KV5mG6k4pg
I use uTorrent, but I'm looking at Bitlord and Flashget and they look pretty good.
As far as the game: The 1.5 version is compiled with the v7 flash player, and it occasionally crashes on my Vista SP1 even when I run it in compatibility mode. I don't know if it's the game, Flash or Vista.
You can save up to 3 reload points so you don't have to start at the beginning each time. However, if you use CCLeaner or something similar, make sure you don't delete the mu09*.sol files.
The 1.5 game has many new actions and scenes, some that I haven't yet found, and I'd say if you like the 1.0 version, you'll really like 1.5.