Make sure to read the LML file instructions of where to put the files, if you see a file that says 'PUT ALL OF THESE IN THE MAIN GTAV FOLDER' then put them in where the executables of the game is. I don't use the install with mod manager green button, I just download them manually, then once they are done, start up mod manager which is part of the LML package.
Now for SP use only, just download LML on this site, what that program does is it tries to convert every fivem vehicle for you to be used in sp.
