Hello , your teacher or training book should reference where to find the database files to use for the exercises. They most likely are not part of the install files for Sage 50, if they are, they would be at a location similar to C:\Users\Public\Public Documents\Simply Accounting\20XX\Samdata\Version*\Universl see this blog for how to find missing .SAI, .SAJ, .CAB files and more should you need to search your computer.