Download SYSLX 2.1.0 Mod Menu GTA V Online 1.50 from the below-provided link.
Start steam or rockstar social club launcher and boot into story mod game in GTAV.
Now put SYSLX folder in App data or just drop it to shortcut provided.
Open syslx 2.1.0 Injector.exe it will self close after process complete.
Go back to GTA V and press * or F4 to open menu if menu appears start GTA V Online.