gModeller extension does not install materials in Sketchup

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Attempting to use gModeller with Sketchup. When I install the gModeller extension, and when I start Sketchup after gModeller has been installed, I get a message 'Failed to install materials’

I am using gModeller trial version:

using a Mac running OS 10.12.4 using Sketchup version 16.1.2418 (Sketchup 2016) [have also tried Sketchup 2017 and Mac OS 10.10.5] Using the gmodeller plugin gModeller-1.18.rbz [Sketchup extension website says it is compatible with Sketchup 2016 and 2017, and with Mac and Windows] When I look for the gModeller materials under the sketchup paint bucket palette, I cannot find them. Anyone encountered this and found a fix?