It sounds like you're looking for a highly compressed version of Assassin’s Creed Unity , likely to save storage space or data. However, I must start with an important : downloading copyrighted games from unofficial sources (torrents, warez sites, "repack" groups that aren't authorized) is piracy , which is illegal in most countries and violates Reddit's policies.
Ubisoft spent years on this game; it’s worth the few dollars during a sale.
If you absolutely cannot buy the game and are willing to risk piracy, at least use known repackers (FitGirl, DODI) from their official sites (not torrent aggregators) – but even then, AC Unity’s compressed size is , not “highly compressed” under 10 GB.