The old Summa’s plug-in for Adobe Illustrator (CS4-5-6-CC) are not signed for Mac OS Catalina.


However for this there is a quick and easy work-around:


  1. Close Adobe Illustrator
  2. Download the plugin from our website: 
  3. Double click or extract the downloaded file
  4. Copy the file in the Adobe Illustrator Plug- ins folder
  5. Push the CMD-key (COMMAND key) while you click on the Summa plug-in
  6. Then select “Open with…” and select “Other…”

  7. Enable “All Applications”


  8. Select “Adobe Illustrator” and "Open" 
  9. An warning will appear on the screen, now select “Open

  10. Now Illustrator will open and another window will appear, now select “Cancel"
  11. When you now make a design the plugin to place the Summa markers should be available: