Thanks for these links and details.

Is it a demo version somewhere ?

You can find the demo version here: https://render.otoy.com/downloads.phpI think you will need to download and install both Octane Standalone and the Carrara plugin. As I recall, you need to install and authorize the standalone first, then the plugin. For the Carrara plugin, just click on "Carrara" at the bottom of the plugins listed on the left hand side of the page and it will show the download button/link. 

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