Once you purchased Integral Pro and downloaded the theme file, you must install it like instructed here http://support.themely.com/knowledgebase/how-to-upgrade-integral-lite-free-to-pro-version/
Follow the instructions, then you can enter your license key in Appearance > Theme License. That will allow you to continue receiving new theme releases directly from the admin panel instead of having to re-install them.
Let me know if you still have trouble.
- This reply was modified 6 years, 11 months ago by Hans (Support Admin).