If you have not already downloaded the MathType 6.9d installer, you will need to do so.
The installer is available here.
You will need the product key (shown below) to activate the installer.
To unlock MathType, go to MathType’s Help menu and select "About MathType", select "Unlock MathType" and enter your product key (shown below).
Please contact ITO Service Call Centre (3411-7899 or email@example.com) to request a product key.