MathType 6.9 is a legacy version of the powerful interactive equation editor that allows users to create mathematical notation for word processing, web pages, and desktop publishing. While it was once the industry standard, it was officially deprecated on by its developer, Wiris.
If you need MathType for free, here are legitimate alternatives: mathtype 6.9 product key free download
To download and install MathType 6.9, follow these steps: MathType 6
Websites offering free keys are notorious for bundling downloads with malware, spyware, or ransomware Software Instability: or ransomware Software Instability: