After purchasing Balsamiq Wireframes for Desktop, you received an email from noreply@balsamiq.com or billing@balsamiq.com . The subject line typically reads: "Your Balsamiq Wireframes License" or "Order confirmation." Search your inbox (and spam folder) for these terms.
guide explains how to enter your license information into the registration dialog. License Recovery : If you have lost your key, you can use the Balsamiq License Lookup Tool license key balsamiq