I paid for extension but didn't get anything in the mail and I can't download it either.

The extensions you purchase on our website are being sent to an email you specified during the purchase. An email should contain the purchase information, extension archive, your license file and installation guide enclosed to it. Please note that sometimes email services can mark such emails as spam, therefore make sure you check your Spam folder after the purchase to see if it landed in there. If anything, feel free to contact us in Live Chat specifying your order number.