You'd hope that a company wanting to use Eagle would wish to do so legally.
I sold my Eagle 7.7 licence via the forum back in 2018. That was the last non-Autodesk version, I believe. It was last updated in 2016 from the archive downloads on the Autodesk site. I wonder if it will work OK on current OS versions. I had issues with it, which along with going to a SaaS solution, was enough to push me over to Altium. Plus, I got a very good deal on a permanent licence.