If you have purchased the digital version of the software it is normal for you to receive an email with the serial numbers of the programs you have purchased and with instructions on how to download and install them on your PC: it works in this way.
At the time of purchase, you can decide if you want a digital version or if you want to receive the package via a courier.
In my opinion it would be better to contact Magix sales office and ask if it is possible to receive physical support for the installation even if, in the utmost respect of your difficulties, I do not see the problem in downloading a program, double click on it and install it...