Some quick fixes for addon vehicles (not replaces). In summary, you need to place the vehicle (folder containing dlc.rpf) with your dlcpacks and you need to add one line with the exact same folder name in dlclist.xml. Here are more detailed instructions:Extract the downloaded car mod. 7-Zip is free software that will unpack (extract) just about anything including rar, zip, 7z, and even OIV packages. Particularly if you're a beginner, read the installation instructions that came with the mod, after extraction. From the extract, the folder you want is the one that contains a file called dlc.rpf. In rare instances, the folder will not have the correct name, for example it might be called File or Folder. Rename it based on the instructions that came with mod only if necessary. Place the Folder containing dlc.rpf here: root folder\mods\update\x64\dlcpacks where the root folder is your game folder, the one containing GTA5.exe. You can do this step from Windows Explorer or from Open IV Now with OpenIV,, add the line from the instructions into your dlclist.xml carefully, normally place it at the bottom just to be safe.
5.1 You will find the dlclist.xml here: root folder\mods\update\update.rpf\common\data Just look for Mods folder in OpenIV. You need to be in Edit mode.
5.2 Select Edit Mode from the OpenIV menu (top, go to the right).
5.3 Then open dlclist.xml by right clicking it and choosing Edit from the context menu that appears.
5.4. Add the line per instructions at the bottom, for example the instructions say <Item>dlcpacks:/harleyvr/</Item>
Entry will look like this:
</SMandatoryPacksData> Save dlclist.xml and close OpenIV Start GTAV and your favourite trainer Spawn the car mod using the spawn name provided in the instructions. N.B. Spawn name could be different from folder name.
That's it for the majority of addon cars.
Advanced Tip: what if the instructions don't give a spawn name and it won't spawn using the folder name? Go into OpenIV, find the mod, find the mod's .rpf file and drill down (keep clicking the left side panel) until you find vehicles.rpf. The file name inside will be your spawn name. In our example above, we would find a file called hvrod.yft. Drop the extension and use hvrod to spawn.