Sketchup 2024 no longer supports saving to older SU file formats.
This is a huge issue for VCarve users who must import the SU2016 file format for vector processing/importing.
Please bring back the ability to save to older SU formats. This is a huge problem for us and could force us to move to another platform (Shaper3D/Fusion/etc.)
This ability has been removed but is still exposed to ruby and extensions for now. @dezmo has written an extension that can return the functionality for the present, until further changes to the API in future versions.