Right-click the installer and select "Run as Administrator" to ensure it has the permissions needed to write to the system directory.
If you are looking to restore your licensed copy of AutoCAD 2002, follow these steps to resolve the .dll error: download cdilladll autocad 2002 exclusive
If the installer fails, right-click the executable, go to Properties > Compatibility, and set it to Windows XP (Service Pack 3). Right-click the installer and select "Run as Administrator"
If you'd like links to for legacy Autodesk products. right-click the executable
Install Windows XP inside a VM (like VirtualBox) to run AutoCAD 2002 in its native environment.
If you are struggling to get 20-year-old software to run on a modern machine, consider these alternatives: