Thanks for your answer Set. I have already downloaded the basic installer. The problem occurs when I am trying to install the program components of Movie Studio 17 on my PC. I have tried disabling Windows Defender and the Antivirus, but that did not work.
Thanks Musicvid. Now, I tried to download the full program (Windows Defender and Antivirus disabled), but it seems that the issue is a connectivity problem with server Magix (that is what Windows diagnoses). I will try VPN betternet (thanks again Set).
I scrolled down to Movie Studio 17 (direct link) and changed the server in the link from "dl04.magix.net" ("dl-us01.magix.net") to "dl-nl04.magix.net". It worked!