If you have previously installed LTTR/INK manually or with the Extension Manager, this is the recommended safety way to uninstall the plugin without hassle.
- Open Anastasiy's Extension Manager
- In the left menu select Adobe Illustrator
- Within the "Extensions" list select LTTR/INK
- Click "Remove"
- Wait until the dialogue window announces the successful removal.
- Click "Done" to close dialogue window
That's it. You have successfully uninstalled the LTTR/INK plugin.