PattyB0Y

Did you modify "police" and "police4"? If not, you might have to use a mod menu to spawn the vehicle, or some "traffic flow" script for gta 5. I don't know if they have one yet.

Open rebuilt archive, just follow the instructions and you should be fine.

That's for the .rpf files inside your GTA 5 directory. When you replace the vehicles, click the "file" next to "edit" at the top. Press rebuild in that menu. Once that is done, it should show a line in the rebuild tool stating the name, location, and type of modified content. Double click that to make sure it is highlighted, then press rebuild. Once that is complete, it will say "open rebuilt archive?", press yes. Then go back to "file" at the top and select close all archives. Then close open iv and make sure it is not opened when you are in-game. This has happened to me before, so I used this method and it started working. Hope this helps.

I don't know if this will help you or not but when you replace the vehicles, click the "file" next to "edit" at the top. Press rebuild in that menu. Once that is done, it should show a line in the rebuild tool stating the name, location, and type of modified content. Double click that to make sure it is highlighted, then press rebuild. Once that is complete, it will say "open rebuilt archive?", press yes. Then go back to "file" at the top and select close all archives. Then close open iv and make sure it is not opened when you are in-game. This has happened to me before, so I used this method and it started working. Hope this helps.

Is your copy with steam, or do you use the rockstar games launcher?

Are you in the right directory? x64e.rpf -----> levels -----> gta5 -----> vehicles.rpf What I do is copy and paste the unmodified GTA 5 folder from steamapps, to my desktop, just as a backup. Then I would start modifying the files.