Thanks, I made it work with the manual install, but just tried that to test it and didn't work either. (I had tried it before too but forgot to put it on the list).
I did watch the video instructions two times and took it into account, to no avail. Did exactly as told by the written and video instructions.
I also watched the video instructions for the manual install before going that route, just in case it said something that could help me.
I don't know why it doesn't work, but the time it always fails while trying to download from mega, it seems to me that it's not my computer but the way it's trying to download the downgrader zip file. Or maybe permissions on my pc to download it, but I'm on a pretty freshly installed win 10 from 3 days ago and didn't change almost anything to it. And running it as admin should fix that.
Did you solve this by chance? I keep getting the same error 
