Before attempting to install a file like AutoCAD..2020.2.macOS.net.zip , ensure your Mac meets the official system requirements for this legacy version:
If you have a legitimate license, you can activate the software using your Autodesk ID or a serial number found in your Autodesk Account . AutoCAD..2020.2.macOS.net.zip
Double-click the .zip file to reveal the .dmg installer. Before attempting to install a file like AutoCAD