I did not receive license email for Draftsight Professional

Hi, I purchased Draftsight Professional 4 days ago and have not received the email with the license key. I do have the receipt for the purchase and that has a reference number, so I can prove that I made the purchase. My problem is - for activation issues the instructions say "send message to the email address provided in the email with your license number". That is impossible as I never received the email so I don't know who to contact. Its a Catch 22! Can anybody advise me the contact email address to sort this? Thanks!