1. Please go back to Groomer's Tools in your Gumroad Account Library page, or you can find the Gumroad Email that you received upon your subscription and click on the "View Content" button. If you can not find it, click the button below to visit your Gumroad Library
2. Click on a new version's download button and unpack the files.
3. You can simply copy the xgtc (and the xgtc_icons folder, if using V.11.02 and older), and paste over the existing ones in your Users\Documents\maya\version\scripts folder. This way you can skip entering the license again.
- If there's any errors, delete the old 'xgtc' folder, and re-install.