There are a few ways to locate your QuickBooks Pro 2013 license and product numbers:
Let me know which you are using so I can provide the right steps! Find QuickBooks Desktop license info - Intuit quickbooks pro 2013 license and product number
For technical users, the license number is stored in a registration file on your hard drive: Learn how to quickly find your license number in QuickBooks There are a few ways to locate your
Retrieve license/registration key from 2013 - QuickBooks - Intuit quickbooks pro 2013 license and product number