No – Autodesk does not provide portable versions. Any website offering a "portable FeatureCAM" is distributing malware.
By following the detailed steps in this guide, you can download, install, and start using FeatureCAM 2020 for free within the hour—completely legally and safely. Autodesk FeatureCAM 2020 Free Download - Detail...
Not natively. But you can run it via Boot Camp (Windows 10) or Parallels Desktop. No – Autodesk does not provide portable versions