It is considered optional because it is a large file ( .bin suggests high compression but significant data) that is only useful for a specific demographic of players. Excluding it saves hard drive space and installation time for the majority of users who play in English, Spanish, French, etc.
: Ensure setup.exe and all downloaded .bin files are located inside the exact same folder. fg-optional-arabic.bin
You prefer playing in English or another supported language. Skipping it saves storage space and reduces download time. It is considered optional because it is a large file (
What "optional credits" in FitGirl selective download repacks? fg-optional-arabic.bin