usdz to 3ds conversion is typically searched by users that want to either directly convert USDZ (Universal Scene Description) 3D models to 3ds Max format (.3ds) or at least import/transfer the content to 3ds Max.
3ds Max actually supports Universal Scene Description files, but only lists the uncompressed files (usd, .usda, .usdc) on the Autodesk's help page. Perhaps you just need to unzip it before you can import it to 3ds Max.
Except for that, you will have to either rely on some 3rd party solution for the export, or use exchange format (like FBX) to transfer the 3d models.
Updated: September 20, 2023