Browse to the Replace Car Pack V-1-1-oiv file you downloaded.
Since it uses the OpenIV Package Installer (.oiv), you don't have to manually drag and drop files into deep subfolders. Gta 5 Replace Car Pack V-1-1-oiv LINK Download
GTA 5 Replace Car Pack V-1-1-oiv: The Ultimate Realistic Vehicle Overhaul Browse to the Replace Car Pack V-1-1-oiv file you downloaded