The free version is fully functional but may have limitations (e.g., max 100 clients or 500 invoices). For most home users and freelancers, the free tier is more than enough.

Restore from backup (File → Restore). If no backup exists, use the built-in repair tool (Help → Repair Database).

A: Yes – Pro version supports QIF and CSV import. Free version allows manual CSV import with field mapping.

Since Billing Explorer is no longer supported, these modern, actively maintained tools are recommended for Windows 10 users: Invoice Ninja