There is a ReadMe.txt file provided when you purchase Globe Plants assets. It says:
For SketchUp and Enscape Render users, please follow the steps below to get materials and textures load properly:
- Create a new folder at the root of C drive called “Globeplants_Enscape”. It should be C:\Globeplants_Enscape
- Copy all files from folder SKETCHUP into the newly created folder. You can copy all the proxy files into other folders as you like as they won’t be affected by user path. The proxy files are SketchUp files without extended name “ _fullGeometry”
I agree that this txt file is not very obvious!