Frequently Asked Question
Download and open this version of Notebook:
This version of Mark/Space Notes will open on Mac OS 10.9 through 10.14. This will at least help you to view and export your notes. There are no versions of Notebook that work on Mac OS 10.15 or higher.
You can export notes as text files by dragging them to the desktop.
Alternately, use this method to transfer Notebook to Apple Notes:
Missing Sync and Mark/Space Notebook have been discontinued.