: You cannot use "Part 1" alone. You must download all subsequent parts (Part 2, Part 3, etc.) for the archive to be valid.
: Because the multiplayer data can be several gigabytes, it is often split into smaller parts (Part 1, Part 2, etc.) to make downloading easier and more stable. Why is it labeled "Optional"? setup-fitgirl-optional-multiplayer.bin.part1.rar
: Place the resulting extracted .bin file in the same directory as the setup.exe for your game. : You cannot use "Part 1" alone
: Indicates that the data inside is a binary component of the installer. Why is it labeled "Optional"
This file is a containing "optional" data for a game's multiplayer component.
: If the installer reports a "CRC error" or says the file is corrupted, it usually means one of the .rar parts was not downloaded completely. You should re-hash your torrent or re-download the specific part.
: When you launch the installer, it will automatically detect the presence of the multiplayer files. You will typically see a checkbox to "Install Multiplayer Components." If the file is missing or not in the right folder, this option will be greyed out. Common Troubleshooting