I don't had any errors, i installed manually the repack, step by step and created some MD5, here is the log, looks you have a hardware problem, check your simms memory (memtest) and you hard-disk for possible bad clusters
I only used linux native tools, unrar, srep and 7z, nothing else
Hi Fl0ppy.
For my problem, I ended up downloading the full game (37GB++) and now currently enjoying the game.

Thank you very much for helping me down to solve the problem, where at last my problem is still there. Still, can't extract the archive. Yeah, I guess the problem came from my own computer.
I downloaded a lot of RAR archives and all of them works with 7z's RAR extractor. Only with your archive that this problem exists. But then I gave up and download the full game.
I saw on the main page you repacked a lot of Linux games there, gonna download them now! Thanks for your hard works!