Big Business 14 includes changes to work with a new database for Biz App 14 on iOS.
Starting with Biz App 8, there have been several custom solutions for iPhone and iPad. These are updated to work on new versions of Apple's database on an as needed basis.
Each Biz App solution is self-contained and may run with new versions without issue. Changes may include access to new fields and data which does need updating to utilize.