Can I use IrisBG on a Mac / macOS?

Yes, with a virtualization software it is possible to use IrisBG on a Mac / iOS.

Popular virtualization software: 

• There is a free version of virtualization software available from Oracle: https://www.oracle.com/virtualization/technologies/vm/downloads/virtualbox-downloads.html
• GoToMyPC: https://get.gotomypc.com/

A good resource on this topic: 5 ways to run Windows Software on a Mac: https://www.howtogeek.com/187359/5-ways-to-run-windows-software-on-a-mac/