Eneroth Legacy Save
Quickly saves model to a legacy Sketchup format.
Eneroth Legacy Save

This extension quickly saves the model in a legacy SketchUp version. In contrast to utilizing the native Save As... command you don't need to accept the file location and confirm overwrite on each save.

If you have colleges stuck in older versions or want your files to be accessible using SketchUp Make, which stopped being developed after version 2017, you may find this extension useful.

Activated from File > Save in Legacy Format.

Source code available at Github.