Nice! It was just a folder problem indeed: with the plugin pasted in my Engine/Plugins/Marketplace folder, it works perfectly now (and the hands tracking already works too).
So I guess I’ll just explain to my small team they should install this plugin in their computers engine files too, until we get the official 5.6 plugin release that I should be able to share directly within the project then.
Thanks anyway, You’re a lifesaver 