: Select the game > Properties > Local Files > Verify files . 4. Manually Restore Missing DLLs
Download the latest version from the official Ubisoft Connect website .
Add the game's installation folder to your antivirus to prevent it from being deleted again. 2. Reinstall the Ubisoft Connect Client : Select the game > Properties > Local Files > Verify files
: These act as a bridge between the game and Ubisoft’s servers for DRM and online features.
: The main executable for the single-player mode of Assassin's Creed IV. Add the game's installation folder to your antivirus
If the files are completely gone and verification doesn't work, you may need to manually place them in the game directory.
: A specific library used to trigger and sync in-game achievements with your profile. Common Solutions to Fix Startup Crashes 1. Check Your Antivirus Quarantine : The main executable for the single-player mode
If you are playing through Steam or Ubisoft Connect, you can automatically repair missing or corrupted files like ac4bfsp.exe .
The most common cause for these files going missing is your antivirus software flagging them as a "false positive". Open your or third-party antivirus. Check the Protection History or Quarantine section.