On a clean Debian 7 install the plesk autoinstaller returns an "unable to fetch parallels installer" error.
It seems that it's trying to download "http://autoinstall.plesk.com/Parallels_Installer/parallels_installer_Debian__x86_64" which doesnt exist. If anyone is having this error just download "http://autoinstall.plesk.com/Parallels_Installer/parallels_installer_Debian_7.0_x86_64" instead and run it to start the installer.