I should explain my earlier issue too.
I downloaded the April 25th version. It worked for a few days until one day I started on the Paths page on FGRun. The boxes were empty, but I soon figured out what to put in them. Then I went to the aircraft list and every aircraft appeared twice on the list. Then I tried to start FG, but got the same error. I tried reinstalling twice, because the first time I accidently installed it on the wrong drive, but the aircraft list was normal there. I transferred it to the other drive, refilled the Paths boxes and guess what, the aircraft list doubled again. So I got rid of that one and downloaded the latest version. But I can`t get this one going.
As 439Tiger said, one option would be to get GIT, but I`m not going to.