While I couldn't find any information on a free product key for MathType 7.4.4.516, there are some free alternatives and options available:
MathType is a popular equation editor software used by students, teachers, and professionals to create mathematical equations and formulas for various documents, presentations, and publications. In this guide, we will discuss MathType 7.4.4.516 and provide information on how to obtain a product key for free. Mathtype 7.4.4.516 Product Key Free