1:- Install Menyoo.

2:- FOR SIDHHU MOOSWALA LIVERY INSTALLITION PATH :-
path : GTA V\mods\update\x64\dlcpacks\rrstartech\dlc.rpf\x64\levels\gta5\vehicles\rrstartechvehicles.rpf\

turn on edit mode

drag and drop
rrstart.ytd

CAR INSTALLTION :-
installation :

put the "rrstartech" folder to gta v> update x64>> dlcpacks

then go to dlclist.xml in update>> update.rpf >>commons >> data
edit mod and add line

ADD-ON