You won't need FiveM for LSDPFR, no. Try to navigate to C:\Program Files\Epic Games and see if you see a Grand Theft Auto V folder there. If you do, you should paste all the Rage Files into there, and then also install LSPDFR into there. If there is no folder for Grand Theft Auto there you can go into Epic Games library, click the three dots next to the name of the game, press create a shortcut, then right click the gta launcher on your desktop and click open file location, then paste Rage and LSPFR files into there.