If you previously purchased a licence for an OpenType Std font (support for Latin-based languages only) and now need the OpenType Pro version (support also for Greek, Greek polytonic, Cyrillic and Vietnamese), you can upgrade your licence. Rather than paying the full price of a new licence, you will pay only the difference in price. Log in to your account, go to My Fonts and click on the Upgrade button.
We are also happy to help you with upgrading your fonts. Simply send us an email.