@tig said:

As I explained... The MAC OS Mojave is only compatible with SketchUp v2018 or newer.
So your SketchUp v2015 is too old to run successfully on your current MAC OS !
You might be able to install v2015 and then install extensions from RBZ files, but chances are it won't work properly... as you have found out.

well, thank you very much for your time! now, i know what to do!

@tig said:

It may well be that your current SketchUp version will not work with your current OS - at least not faultlessly.

yes, this is what is in my mind, my os dont run with sketchup2015 , dont know why. i have installed the RBZ file, with : preference-install extention, this is what i have in sketchup 2015. and yes, i have installed each extention separatly! and restarted sketchup at the end, with no result! .

sorry, iam the same user, my old username was : okavango,now i use vimage. sorry for the confusion! my Mac is at the office , at home i have windows just for precision.