Thanks! I did my best to make it high quality in visual and ambience. I don't know what causes the rar file problem, but i will examine it. Thanks also for the feedback.

I had the exact same problem. I couldn’t extract the archive with 7zip.

But after reinstalling 7zip with to the most recent version it worked fine. So I guess this will solve the problem.

@Emre: Maybe there is some fancy new compression switched on in the .rar-file without backward compability?

Best Regards!

Yes, I guess that's the problem. I am using winrar and i didn't think there would be such a problem. I had no idea. Thanks for info.
I will use zip from now on and i will re-upload the project with zip compression soon.

Okay guys, sorry for the rar problem and thank you very much for informing me about it. I uploaded two versions and edited the first post. I hope there will be no problems with these.