MathType 7 operates under a subscription-based model. When you first download the software, you receive a limited free trial. Once this period expires, the software reverts to a restricted mode or stops functioning.
Always purchase your activation key from the official Wiris MathType website to ensure it is legitimate and functional. Important Information Regarding "Free" Activation Keys Mathtype 7 Activation Key
Watch this walkthrough to see how the installation and activation process looks in practice: MathType installation and basic use YouTube• Nov 10, 2020 The Masterpiece Begins MathType 7 for macOS product key validation error - Wiris MathType 7 operates under a subscription-based model