Once you've installed AutoCAD 2017, you'll need to activate it using a product key or by signing in to your Autodesk account. Here's how:

Before you click on any installer, preparation is key. A failed installation often occurs due to overlooked prerequisites.

Go to Tools → Options → Open and Save → File Save and set to AutoCAD 2013 Drawing (*.dwg) . This ensures compatibility with older clients.

If all else fails, use the (download from Autodesk). It removes all leftover registry keys, services, and components. Then restart and reinstall.