Complete the installation. It is highly recommended to check the "Limit RAM to 2GB"
If this is part of a simulation game (like FlightGear ), the fg-optional-editor.bin file might be used to create, edit, or test 3D models, scenery, or scenario files.
Repacks generally include a QuickSFV or MD5 hashing tool to check file integrity before installation begins. If you chose to skip downloading fg-optional-editor.bin , the verification tool will flag it as or "FAILED."