To get the full version of MathType 6.9 , you typically need a product key provided at the time of purchase. Note that version 6.9 is now considered an End-of-Life (EOL)
For users with a valid license, activation is straightforward: MATHTYPE 6.9 mathtype 6.9 product key free download
: For a completely free, open-source alternative, LibreOffice includes a dedicated formula editor called "Math" that works similarly to MathType. To get the full version of MathType 6
The short answer is: , but with certain limitations and risks. but with certain limitations and risks.