Unable to install Render(in) in SU 2018 pro on Mac


I downloaded Render(in) 2018 plugin (Abvent_Renderin309_skp2018.rbz) to use it in SU 2018 pro.
When I open the Extension Manager it is loaded and signed, but I don’t see anything in SU itself… Under preferences there is also no « extensions » in the side menu.
I uploaded some screenshots. Hopefully somebody can help me…

Thank you in advance!

Schermafbeelding 2019-10-24 om 19.03.08.png

Schermafbeelding 2019-10-24 om 18.59.19.png