- Open any glyph in Glyphs.
- Switch to the LTTR/INK tool by clicking on the "L" icon in the toolbar. A panel with LTTR/INK logo appears near the bottom of the drawing area.
- Click on the LTTR/INK logo and select Registration... in the menu. A window containing information about your licence status appears.
- Click on the I have a licence, I have a full licence or Change licence button.
- Locate the Licence.lttrinkGlyphsLicence file in the downloaded package and confirm the selection.