No. Autodesk removed all download links for AutoCAD 2019 after its end-of-life date. Even authorized resellers cannot sell new licenses for it. Any site offering a direct download of “AutoCAD 2019 full for Mac OS X” is .
If you are running , you need the last compatible build (AutoCAD 2019 SP2). Newer "exclusive" patches may require High Sierra. Always disable Gatekeeper temporarily via sudo spctl --master-disable in Terminal if installing an offline version. autodesk+autocad+2019+full+mac+os+x+exclusive