How to save the downloaded material?

Hello! On the official website there are kits (Renderer for architectural visualization - Corona | Chaos) that I would like to use my previously created scenes.
How to open / save / import these sets in my library?

Hi, this should be useful: https://coronarenderer.freshdesk.com/support/solutions/articles/12000010763
But do let us know if you still need some help.