mqo to pdo conversion is in most cases searched by users that are interested in reusing Metasequoia 3D content for making new paper craft models in Pepakura Designer.
According to Pepakura Designer website, the tool supports import of MQO format, so this is certainly possible. As for 3rd party alternatives, no such tool exists and using the original software with purchased license is the only way how produce .pdo files.
Updated: January 2, 2024