If you cannot find your email, you can look it up via your Intuit account:

If you need the exact product number for your specific copy of QuickBooks, use the inside the software or check your Intuit account purchase history.

QuickBooks "product numbers" identify the specific version and year of your software (e.g., Pro 2024 or Enterprise 2021). These 6-digit codes (formatted as XXX-XXX) are essential for installation, re-registration, or when contacting support. How to Find Your Product and License Numbers

The method for finding your product number depends on whether you are using the Desktop or Online version of the software. 1. For QuickBooks Desktop (Pro, Premier, Enterprise)