If you are strictly offline, you may need to provide an Activation Code . This is often generated based on a "Request Code" provided by the software during the activation prompt.

AutoCAD 2013 was designed for Windows 7 and XP. While it may run on modern operating systems, it is not officially supported and may require "Compatibility Mode" to function correctly. AutoCAD 2013 serial number and product key

Follow the on-screen prompts to choose your language (e.g., English) and operating system version (Windows 64-bit). Activation Process

Historically, students with a valid .edu email could access activation keys that lasted until graduation.