The Autodesk Material Library is installed by default using the product installer; it can be removed using the Windows Control Panel. 
If the default material library was removed, you can reinstall it with the following steps: 
- Place the install media for the product in your disc drive or locate the download of the product if you purchased it electronically. 
 
- In Windows Explorer or File Explorer, browse to the product installer, and open the following folders: 
- 
..\Content\ADSKMaterials\<release>\CM
 
- 
..\Content\ADSKMaterials\<release>\ILB
 
  
- Run the Microsoft Installer (MSI) files located in the two folders and accept the default values.