A permanent installation requires an active license. There are three ways to achieve this through official channels: System requirements for AutoCAD 2018 - Autodesk
: Windows 7 SP1, 8.1, or Windows 10 (64-bit recommended). CPU : 1 GHz or faster processor. Autocad 2018 Download And Install Permanently
: Find AutoCAD in your list, click the version dropdown, and select 2018 . Choose Method : A permanent installation requires an active license
: The fastest method; it downloads and installs simultaneously. click the version dropdown