Note: This specific "Expert Mode" extraction was restricted in version 3.2 and later.
If you have a non-protected version of the file or are working with similar "SDF" mesh data, dedicated software can bridge the gap: How to convert an SDFA file to STL? - Facebook sdfa to stl
It is worth asking: Why bother converting SDFA to STL at all? Some next-generation slicers (like those using ) can print directly from distance fields. Hyperganic and nTopology are pioneering workflows where volumetric data is the manufacturing file. Note: This specific "Expert Mode" extraction was restricted