I downloaded game twice with the gog downloader.Gog downloader says that its 100% but when i try to instal the check fails(it fails at the end) and i get corrupted bin files for example 1and 4 I'm wondering how to replace them cuz the downloader combined them somehow

I can't even login on the GOG Downloader, so I won't yet be able to tell you what you can do about that. I can, however, suggest that you go to My account, find the Witcher game on your shelf and download the .bin files in question, individually, in your browser. It should take a wee bit more, but I think it'll fix your problem.

i deleted all the stuf that gog downloader instaled and downloaded bin