How to solve problem with installing SketchUp Pro exporter?

Development Pipeline & Plugins Plugins
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1

I just download the 4.21E exporter for SketchUp Pro but when I want to install it.

272428-ue-exporter-plugins-error.jpg
272428-ue-exporter-plugins-error.jpg1324×688 119 KB

This window shows to me even I already have the SketchUp Pro 2018.

Any help?