Reinstall Default Materials in SketchUp Pro 2018

I seem to have lost all my default materials. They are not in my user material folder and the appdata materials folder is empty. Is there someway to reinstall the default materials without having to reinstall the entire program? Thanks

You can rerun the installer (as administrator) and choose the Repair option.

I recommend doing this if the distributed materials are no longer in the %ProgramData% path.

"C:\ProgramData\SketchUp\SketchUp 2018\SketchUp\Materials"