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Can't install Modo Material Importer plugin

Hello everyone
This is my first post here, I’m just starting to discover Unreal…
I use Modo, and can’t install the Material Importer downloaded from the Marketplace… I get this message, and then impossible to launch the install, or get out of it for that matter…
I’m on OSX (10.12.6, Modo 11… I know that the modo plugin provided by Foundry isn’t up to date (so not installed), so is there a connection ?