Keeps crapping out during install no matter HOW MANY TIMES I DOWNLOAD THE INSTALL FILE -- ERROR: The setup file is corrupted. If you downloaded this file from the internet, please download it again. Expected file size: 1252975360 Actual file size: 639002242
As a first step try disabling any Firewall or Antivirus software you have running during the download. Sometimes these can interfere with the download an/or installation process.
If that produces no improvement email infoservice@magix.net, explain what is happening and ask if they can give you a link to the download of the FULL program rather than the Download Manager.