If you want to use single-player mods without interference, you should disable BattlEye through the official launcher rather than using unknown .rar files.
FiveM is designed to run separately from GTA Online's infrastructure. FiveM-Batlleye-spoof.rar
FiveM usually disables the standard GTA V anti-cheat components automatically to allow its own modifications to run. If you want to use single-player mods without