After the latest update, GTA V won't take vehicles installed via package installer, such as @Captain14's Sheriff Pack as well as his LSPD Pack. If I have just one installed or the other, it still does not work. I've found that packages containing single vehicles, such as BxBugs' Charger package, work. I currently have about 16 add-on cars; and if I take them out nothing changes, so it is not something with the modified gameconfig.xml.

Again, if multiple vehicles are installed via OpenIV package (2+ in the package), the game crashes, no matter how many are in. Single-vehicle packs work fine, as well as 16 addons. Taking those addons out and putting in multi-vehicle packs crashes, so it's not the gameconfig.

If I install a multi-vehicle pack that does not use the Package system, such as this pack by BlackJesus, the game works.

Have you got a gameconfig like this installed? https://www.gta5-mods.com/misc/gta-5-gameconfig-300-cars

You could double click the oiv and install it the regular way.

12 minutes ago, Starmix said:

Have you got a gameconfig like this installed? https://www.gta5-mods.com/misc/gta-5-gameconfig-300-cars

That's the one I have