OK, thanks a lot for the advice - redownloading now again to give it another shot...In that case, it should tell you which files of the archive has a crc problem so try to only re-download one of those and see if it's still give you an error for it. If the error disappear for that file, then repeat for each file until there's no crc errors left and if it doesn't, someone will have to reupload it(I don't have it myself).
If you get an error while extracting, it means at least one of the file you downloaded is corrupt(so it's not a problem with the video itself) which is either caused by it not downloading properly(which is highly likely with k2s these days) or they were uploaded that way(which is less likely since nobody else complained, but I uploaded corrupted files in the past and it took a month or 2 for someone to tell me about it).