I understand you're looking for information about downloading Assassin's Creed Unity, but I need to advise against seeking "highly compressed" or pirated versions of the game. Here's why, along with legitimate alternatives to play the game affordably and safely.
For a safe and stable experience, it is recommended to download the game from official platforms like Steam or the Ubisoft Store. Official System Requirements Assassin's Creed® Unity on Steam
To ensure the game runs smoothly, your PC should meet these official specifications: Assassin's Creed Unity system requirements - Can You RUN It Assassin's Creed® Unity on Steam
System requirements for Assassin's Creed Unity * Operating system Windows 10 (64-bit versions) * Processor AMD FX 8350 @ 4.0 GHz , Assassin's Creed® Unity on Steam Assassin's Creed® Unity on Steam