If your MathType 7 activation key isn't working, check the following:
Q: How do I obtain a MathType 7 Activation Key? A: The activation key can be purchased from Wolters Kluwer or authorized resellers. Mathtype 7 Activation Key
Wiris offers a legitimate, fully functional 30-day trial of MathType 7 (or MathType 8). This gives you a temporary activation key via email. If you need to finish a single project, this is your legal solution. No malware, no guilt. If your MathType 7 activation key isn't working,