Relink Bitmaps is a script to easily relink all missing files (Bitmaps, VRayMeshes, Mental Ray Proxies, VRayHDRI, IES, etc) when they change directories or when you move computers.
Instalation/use help link: https://apps.autodesk.com/3DSMAX/en/Detail/HelpDoc?appId=2039551202535585769&appLang=en&os=Win64
I will make a video on how to use it soon.