If you purchased your application directly from Apparent Software (not from the Mac App Store), you can resend your lost license at this page: https://www.apparentsoft.com/lost_license.
If you purchased your applications through the Mac App Store, you can download them again from the "Purchased" tab of App Store application on your Mac. Use the same Apple ID you used to purchase originally.
If you purchased frame packs and didn't keep a backup copy, contact support and we'll send you new links.
You can also contact our support here and we'll help you.