JohanTW wrote:
For some reason I can't download the whole thing

It just stops and the file shows up as if it's finished but when I try to run it, it says that there's an error because it wasn't downloaded completely...
Clear out your internet history and cache that will usually solve the problem, after you do that download this again, It should finish completely.
If it still doesn't download all the way, get Jdownloader or some other download manager as they tend to resume downloads where an internet browser will finish too early and not resume if it stops unexpectedly.