If you have an and you find a safe installer, 123D Design is still a fun, simple tool for 3D printing basics. However, for 99% of Mac users today, skip the download and use TinkerCAD in your browser – it is faster, safer, and does everything 123D Design did.
The status of for Mac is essentially that of a "legacy" or "abandoned" app. While once a beloved gateway for hobbyists into 3D printing and CAD, it has been officially retired for several years . 1. Current Download Status: The "Ghost" App Autodesk 123d Design Download Mac