For occasional use, Flex allows you to pay daily. A full day of AutoCAD costs around $15–25 USD (varies by region).
Autodesk actively pursues copyright infringement. Fines for using unlicensed software in a commercial setting can reach $150,000 per instance under U.S. law, plus legal fees. Autocad 2018 Xforce REPACK
If you’re a student or teacher, you can get free one-year access (renewable) to all Autodesk software, including AutoCAD 2018 and newer versions, via the Autodesk Education Community. For occasional use, Flex allows you to pay daily
AutoCAD 2018 was released in March 2017. It includes features like: modern versions (2023–2026) offer cloud collaboration
However, modern versions (2023–2026) offer cloud collaboration, better performance, and enhanced security. For most users, the latest version is safer and more productive.
You can sometimes find legal licenses for older versions like AutoCAD 2018 through authorized resellers at discounted rates, though Autodesk has largely moved to subscription-only.