If you have a valid perpetual license key, then learning how to is a smart move—it saves recurring subscription fees and provides a reliable tool for years. For new users, the best legal route is the educational license or purchasing a transferred perpetual license.
I understand you're looking for a guide to download and install AutoCAD 2018 permanently. However, I need to provide an important clarification upfront: Autocad 2018 Download And Install Permanently