AutoCAD LT 2019 for Mac is a competent workhorse. It represents a mature point in the development of Mac CAD software where the interface finally matched the hardware. However, it is currently in the "danger zone" of software lifecycle—too old to be supported on current macOS, but too new to be considered a vintage collectible.
Log in to your Autodesk Account and check the product download section for "Previous Versions." 2. Third-Party Resellers