Download Autodesk SketchBook (free version 8.7.1) for your Mac. It gives you 95% of the functionality without the malware risk or OS compatibility hell.
If you strictly need vector-based drawing on a Mac for free, use (open source) or Vectornator (now Linearity Curve). If you need hybrid raster/vector, Krita (free) is superior to the 2013 Designer anyway. A Note on Piracy Many sites claiming "Autodesk SketchBook Designer 2013 Mac OSX free" include keygens or crack files that require disabling your firewall. Modern Mac malware (like the OSX/Shlayer trojan) is frequently hidden in these old creative software installers. You have been warned.
Please read this carefully, as this topic involves , operating system compatibility, and legal/safety risks. Autodesk SketchBook Designer 2013 for Mac OS X: Is It Still Available for Free? Introduction: The Ghost of a Powerful Tool Before the rise of subscription-based software like Fresco and Procreate’s dominance, Autodesk had a unique hybrid weapon: Autodesk SketchBook Designer 2013 . Unlike the standard SketchBook Pro (known for painting), Designer was a hybrid vector/raster application specifically designed for technical illustration, industrial design, and concept art.