There is no ISO available. That is the biggest problem.
So I've started install over night, and found it stopped at 76% in the morning. I've read on forums exactly same error, and people explained that it may have something to do with AVG antivirus (amazingly, I also have it), so I turned it off, restarted again and it went trough (luckily, it did not redownload itself again). I do not know is it just because of restart, or AVG really had to do domething, but... I hate to see that there is no ISO (or at least was not there yesterday), so now I would have to go trough all of that again for laptop...
Also, after all of that, I had problem not being able to access marketplace. That could be just because of overloading servers, since few hours later it worked...
I'm no expert, just sharing my experience...