Ensure your DLC PKGs match the region of your base game (e.g., BLUS30608 for US or BLES01041 for Europe).
The Heavyweight pack works, but the Alternate Classes don’t. Fix: Some repacks split content across two PKGs (Part 1 and Part 2). You must install both and ensure you have the fix_license.rap for each. fight night champion ps3 dlc pkg repack