Because this software runs with (required to edit the registry), older versions often contain unpatched DLL hijacking vulnerabilities. Antivirus programs frequently flag Pro Tweaker as a "HackTool" not because it is a virus, but because it modifies system files aggressively.
Once you have the ZIP file, follow these instructions: Pro Tweaker 0.6v Download
The short answer:
Pro Tweaker is intended for single-player use or specific "tweak-friendly" multiplayer servers. Using it on official, ranked LFS servers will likely result in a ban or an "OOS" (Out of Sync) error, as your car's performance will not match the server's expected data. Technical Requirements Because this software runs with (required to edit