I created a small batch file that will backup or restore DLL and custompluginvariables.json files.
All you need to know is the path to the LMU install folder>
Usually looks like this:
(C:\Program Files (x86)\Steam\steamapps\common\Le Mans Ultimate)
But you may have it on a different drive or folder.
This small batch file can backup dll and json files needed to use Racelab with LMU. It is always useful to have backup for any future reinstall.
Download RACELAB_LMU_MANAGER.BAT