Even if you find an old CD key from a decade ago, activation servers for MathType 6 and earlier have been shut down. Those keys cannot be validated.
To use MathType 7 legally and securely, you should use the official channels provided by the developer, : mathtype 744516 product key free top
MathType offers several legitimate licensing options: Even if you find an old CD key
The safest, most reliable path is to use the official 30-day free trial to evaluate the software. For long-term use, the best options are to purchase a legitimate license, inquire about access through your academic institution, or explore the many powerful, free, and legal alternatives like LibreOffice Math or Overleaf. By choosing a legitimate path, you ensure a secure, stable, and productive experience without the headaches and hazards of cracked software. For long-term use, the best options are to
You might already have free access through your institution's existing license.