Broken archives

More than once I came across such a problem: I download games on one computer, dump them on a USB flash drive (I tried different ones), stick it into another computer and, during installation, knocks out an error, such as the archive is damaged.
Then I launch the torrent on the second computer, it checks the integrity of the files and discovers that something is missing.
Problems arose with games downloaded from torrent trackers Rutor, Rutracker, these are all sorts of repacks from the Mechanics, etc.
Examples of games The Witcher 3, The Sims 3, Assassins Creed 4
What could be the problem?