You can Evaluate MathType for 30 days by choosing that option after installation. The full version of MathType will be installed, and you will enjoy the same functionality as the unlocked version.
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If you're currently using an earlier version (3.x or before) you have the option of overwriting it or installing MathType into another folder. The decision as to whether or not to replace your old version of MathType with a new one is one you should consider carefully. 2ff7e9595c