Anyone else having problems browsing to the Ruby reference pages for building extensions? [File: SketchUp Ruby API — SketchUp Ruby API Documentation]
I just tried the link I have saved and got a 404. I suspect they are in the midst of changing it over for SU 2021 which was released today.
Edit: the entire developer support site appears to be down.
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Thanks. It is not just me 
Works OK for me ??
There was about half an hour downtime…
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I am good now from the extension dev side.
However, just downloaded SU Pro 2021 and now my 3dConnexion SpaceMouse does not work 
3DConnexion doesn’t install on SketchUp 2021 yet. But if you copy the extension files manually it works.
I have looked in the Plugins folder for my SU 2020 installation (the same access when writing my own extensions) and cannot see any RB file corresponding to the ‘3DxSketchup’ extension that I see in 'Extension Manager’
If I simply copy the ‘3DxSketchUp.rb’ file from the ‘C:\Program Files\3Dconnexion\3DxWare\3DxSketchUp’ folder on my system into my 2021 Plugins folder, I get this error:
I did reinstall the latest 3Dconnexion drivers after installing 2021, and still no luck.
Try to copy from
c:\Users\All Users\SketchUp\SketchUp 2020\SketchUp\Plugins
3DxSketchUp (Folder )
3DxSketchUp.rb (File)
to
c:\Users\All Users\SketchUp\SketchUp 2021\SketchUp\Plugins\
Sneaky of them to be the only ones to use the ‘All Users’ folder. Looked promising, but now I get this every time I launch SU 2021:
Have some fiddling to do…
And I have confirmed that the same files you mentioned migrated from (yet another Plugin folder) C:\ProgramData\SketchUp\SketchUp 2020\SketchUp\Plugins to C:\ProgramData\SketchUp\SketchUp 2021\SketchUp\Plugins…
Several others have reported these errors, strangely on Windows but not on Mac. It appears that 3DConnexion will need to recompile their extension for SU 2021 on Windows.
From scanning previous posts, this appears to be a common theme following SU major updates…
Oh well, at least SU2020 and SU2021 can co-exist in the interrim.
Yes, and also following macOS updates. 3DConnexion does not have a great track record for timely update of either their drivers or their SketchUp extension.