Searching for a "free repack" of Forza Horizon 2 for PC is a path fraught with technical impossibilities and significant security risks. Despite what various third-party sites or "repack" advertisements may claim, a native PC version of Forza Horizon 2 does not exist.  The Technical Reality 

Online Services: Official servers for Forza Horizon 2 were shut down on August 22, 2023. Only single-player portions remain accessible for existing owners. Unofficial PC Options

. The first full Forza Horizon game to receive a native PC release was Forza Horizon 3 How to play on PC

Step 1: Choose a Reliable Source for the Repack