About an hour. Depends on if you want to see the scenes or just blast through it. It's a great hour though, totally worth it if you don't have a data cap on your internet.
You can't skip stages unless you get someone else's full save, then you can choose which levels you want to do. You can probably find someone's save posted by searching up save in the thread.
It's probably incompatible with whatever software you're using to open rar files. I don't see why that would be the case, but you should probably install
It's probably incompatible with whatever software you're using to open rar files. I don't see why that would be the case, but you should probably install