Continuing the discussion from 3Dconnexion SpaceMouse not working in SU 2023:
To fix it copy your plugins folder from your last sketchup’s folder to the new one for example from 2022 to 2023 from here:
C:\ProgramData\SketchUp\SketchUp 2022\SketchUp\Plugins
to
C:\ProgramData\SketchUp\SketchUp 2023\SketchUp
or if your plugins folder shows up you can copy just the 3Dconnexions plugins