Autodesk AutoCAD r11_c2 Extension for Windows
Released in 1992 by Autodesk
For Windows 3.0 and 3.1

AutoCAD r11_c2 Extension for Windows is essentially an upgrade for
existing AutoCAD r11 DOS users. This product uses the same license as
r11 for DOS and users were permitted to switch back and forth between
running either the DOS or Windows version.

Note: When installing, it will ask for disk 1 of AutoCAD r11_c2 for 
DOS.

This version does not require a dongle. 
