If you are searching for an "online fix" because you are frustrated with ARC Raiders launch or connection errors, there are plenty of official troubleshooting steps you can take:
Paste the copied files into the directory, choosing to any existing files when prompted. Step 4: Configure Steam or the Required Client arc raiders online fix repack
Modified clients often fail to communicate with the game's anti-cheat or authentication servers. If you are searching for an "online fix"