Finally, those Mental Ray legacy assets are outta Max. The only issue is that Max and MR may have written some nodes and custom attributes into your older scenes. So when they are opened, you get some confusing prompts and may not be sure how to proceed. This may help you.
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Put this (NVIDIA) folder to C:\Program Files\Autodesk\3ds Max 2021\Plugins
Then you be happy!
_link to my copy
https://1drv.ms/u/s!AtrESfGiGVPArPMjfPxgOMnd95OqEA?e=Nlx5BQ
Go to “C:\Users\\AppData\Local\Autodesk\3dsMax\ 2021 – 64bit\ENU
find the Plugin.User.Settings
make sure it looks like this:
[Directories]
Additional MAX plug-ins=C:\Program Files\Autodesk\3ds Max 2021\PlugIns\
Additional MAX plug-ins NVIDIA=C:\Program Files\Autodesk\3ds Max 2020\PlugIns\NVIDIA\Plugins\
[Help]