Version 2.0 :

Install

Requires Blender 4.2 or newer.

1. Download MAI_v2.0.0_Blender5.1.zip.
2. In Blender: Edit → Preferences → Get Extensions → Install from Disk.
3. Select the ZIP, confirm.
4. The panel appears in Properties → Object Properties → MAI — Material Import.

Use

1. Select one or more imported mesh objects.
2. Open the MAI panel in Object Properties.
3. Click FBX Revit Materials or FBX Rhinoceros Materials.
4. The status bar shows how many materials were reset.

Version 1.0 (Blender 3.2 - 4.0)
Install the addon in Blender via Edit / Preferences / Add-ons / Install. Then select the zip file.
Remove the older version before updating, then install the new one.
Import an FBX model from Rhino or Revit into a new blank scene. Check if the material values for Metallic, Specular, and Roughness are wrong. If they are, use the addon by clicking the button under Object Properties / Importer / FBX Rhino, Revit.