No problem, you can retrieve your license key here:
https://www.sendblaster.com/extendeddownload/
If still you can’t retrieve your key, contact us by opening a support ticket here:
https://www.sendblaster.com/services/support/ticketing/system/open.php?lang=en
Please, provide us with the informations about your order (The order number, your surname, or the e-mail address you used for the purchase).