Before you commit to purchasing the full license of the INK plugin for Adobe Illustrator, you can leverage the option to try the plugin for free.
Preview of INK for Adobe Illustrator allows you to evaluate LTTR/INK initial for a very short time for free with all functionality and doesn’t require registration.
Preview License gives you a quick sneak peek to all the features of LTTR/INK for Adobe Illustrator for couple of hours.
To leverage Preview License you don't need to do any registration. It is always free.