Try this...
In my case, LSPDFR 0.4 only wants UPDATE folder in MODS folder.
Nothing else.
I ran RPH without auto load LSPDFR to see how game would play with MY custom cars in place.
Game plays fine..
F4, loadplugin lspdfr first response dll...
IT WORKS! .... alas you begin as a cop where you stand - not in your crib.
Still to be resolved is getting my custom LAPD uniforms to work with LSPDFR 4.0.
I need to find our where it is pulling the default game cop from.
Is this where CUSTOM folder comes into play?
More reading and question asking....