Additionally, users with only a MathType 6.x product key cannot log into "My WIRIS Store," the centralized customer portal for managing licenses, downloading invoices, and accessing product keys. This is because the infrastructure for the older version has been largely sunset.
These are minor version updates. 6.9b and 6.9d include bug fixes and improvements over the base 6.9 release. Product keys may or may not be cross-compatible between these minor versions. product key of mathtype 69