Meshmixer License [extra Quality] -

A Meshmixer license refers to the terms and conditions under which users can access and utilize the Meshmixer software. As a free software, Meshmixer does not require users to purchase a traditional license. Instead, users are free to download and use the software without any upfront costs.

and technical support in September 2021. Consequently, there are no "official" license keys needed or available for purchase, and the software is used "as-is". Autodesk Community, Autodesk Forums, Autodesk Forum Licensing for Related Components API (mm-api) : The Meshmixer API is hosted on and includes its own meshmixer license