Install plug in

Hello!
I’m new in th SU world.
I want to install a plugin ( I have the plugin). I have a rbz file. Is it doable on the online ( web) free version of SU?
Can I still download SU 2017 make to install the plugin?
My computer is a Mac with OS 10.15.
Thank you for your help !

No. The web-based versions currently have no option to use extensions.

SketchUp 2017 Make is still downloadable and like the free web version, available for non-commercial use. See: sketchup.com/download/all