Continuing to use MathType 6.9 with a legacy key carries several risks and limitations:
that typically grant access to the latest version (MathType 7), which is backward compatible. Academic Licenses : Many universities, such as Case Western Reserve University product key of mathtype 69
While searching for a MathType 6.9 product key might feel like a quick fix, it is important to know that MathType 6.x has been deprecated Continuing to use MathType 6