"Incompatible" extensions - supplied by SketchUp!

Using the Extension Warehouse window within SketchUp 2017, I navigated to “My Extensions” in order to install some 3rd party extensions I’d been using previously. And here’s something I saw:

Yes - you see it too, don’t you? 4 extensions installed with SketchUp 2017 are show as incompatible!!!

[Vizzini Mode] Inconceivable!!! [/Vizzzi Mode]

they all need updating and you should see the message every time you open SU…

Uninstall and then you can instal the newer version…