Police roleplay mods replace or extend parts of GTA V’s single-player systems. LSPDFR is a major example, with an ecosystem of callouts, vehicle packs and supporting plugins. Compatibility depends on the game build, launcher and each plugin’s dependencies.
Start from a working game installation and follow the original developer’s installation instructions. Keep a backup of files you replace and document the versions you install. Add one component at a time so a failed launch can be traced to a particular change.
Game updates can require a matching update to the script hook, loader or plugin. Confirm that an announced supported build matches your installation before adding large packs.
Use these modifications in single player. The linked developer documentation explains the current requirements and supported workflow; this archive does not distribute third-party executables or promise that an older setup remains compatible.