It is worth uploading various scripts to 3ds Max. These will facilitate your work or speed up your workflow significantly. Relink is one of them.
Relink Bitmaps is a script which enables relinking of all the missing files easily (Bitmaps, VRayMeshes, Mental Ray Proxies, VRayHDRI, IES etc. It is completely free and can be downloaded from the following website:
There, you will find accurate information on how to install it step by step. We will explain to you shortly how it works.
1. When you open Relink, a window will pop up, in which a list of missing textures in the scene can be seen on the right.
2. Click on Browse and select the place where the missing textures might be located. You can select a specific folder or previously drop textures/models into a single large folder and select it at this point.
3. The selected folder will be visible in the grey area.
4. 3. Then click on Relink. 3ds Max will start looking for the missing textures. If you clicked a single small folder, this will take a short while. If the selected source is a large folder for all models and textures on your computer, this may take longer. At the very end there should be an empty grey box.