Did you get a serial number? Log into your Magix account, and go to My Account. You should see the download link (which should have been provided in the email sent by Magix after you paid for it) and a serial number to use when you install and run the program for the first time.
A recent "Thank you for your order!" email from MAGIX continues: "If you have not received the confirmation email, please contact our customer support, specifying your order number, under: shop@magix.net"
I did not receive any email from Magix, any order number, any type of number. Nothing. i bought from here: https://www.vegascreativesoftware.com/br/vegas-pro/ My money was not sent back and i cannot use the software.
A correction: the "Thank You" note was not actually an email, but just a note in the Purchasing process to inform that "Ypur order is complete" (with the order number).