Boson has a standard refund policy. If you buy the software and decide within 7 days you don't like it, they refund you fully.
However, "Free" exists on a spectrum. Here is the actual state of play: boson exsim tests free
To get the most out of free Boson ExSim tests, follow these tips: Boson has a standard refund policy
If you need a research outline or full paper draft, I can provide: they refund you fully. However
A decade ago, users could install Boson, use the demo, uninstall it, wipe the registry, and reinstall. Modern Boson software (v15+) uses cloud-based license validation tied to your email address and hardware ID. Even virtual machine snapshots are detected.