I downloaded what should have been Prince version 15.1 for macOS (link below) but when I execute prince --version I get this:

prince --version
Prince 14.3
Copyright 2002-2021 YesLogic Pty. Ltd.
Non-commercial License

With that --version output I'm not sure what version I have...

Thanks in advance,

Troy

(https://www.princexml.com/download/prince-15.1-macos.zip)

I suspect you still have Prince 14.3 in your PATH?

ACK, pilot error. Thanks for pointing it out.