Contrary to many modern Digital Audio Workstations (DAWs) like GarageBand or Cakewalk, Band-in-a-Box does not offer a fully functional, unrestricted free version.
: A newer version of the DAW plugin is included for free with any purchase, supporting VST3, AAX, and AU formats. Free Alternatives Trial version? - PG Music Forums
To understand why the "free version" is so limited, you need to know what you're missing. Modern Band-in-a-Box (2025 or 2026) has three tiers: