For this purchase you must supply your existing Breeders Assistant serial number.
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Your serial number was contained in the email/message/letter you received when you previously purchased a Breeders Assistant license. If you have the software installed, you can find this by choosing the About... option from the Help menu.
If you still cannot locate your serial number, but are quite certain you bought a license for this product in the past, enter 'Dont know' in the box but in the 'Any Other Information' box below enter as much detail as you can of your original purchase, such as when you bought it and any email/postal address or different name used at that time.