You can save material to the Material Library just by dragging the material from Standart or Slate Material Editor directly to the Material Library that opened in the Project Manager: Or save material to the Material Library using Copy/Paste method: Also you can use the buttons on the panel
FAQ: Project Manager - Page 4
3ds Max 2016 and above (see the additional information tab on the related page of the product ) Another renderers and plugins Note: Please use latest updates for your version of 3ds max 3ds Max Updates & Service Packs For plug-in work it is required to Net Framework version 4.0. https://www.microsoft.com/net/download/framework