Download the Windows installer file from http://intonia.com/Download.shtml. The file will be named InstallIntonia.exe, with some version information. Download to your desktop or downloads folder, and double-click it to install. Once the program is installed, you can start it by double-clicking its icon on the desktop.
If you're upgrading to a new version, the installer will overwrite the existing Intonia installation, leaving all your files, preferences, and license keys intact.
After you verify that everything works, you may remove the installer file from the desktop or Downloads folder.
Download the MacOS installer file from http://intonia.com/Download.shtml. The file will be named InstallIntonia.pkg, with some version information. You will be prompted for your password. Once the program is installed, you will find it in your Applications folder.
If you're upgrading to a new version, the installer will overwrite the existing Intonia installation, leaving all your files, preferences, and license keys intact.
After you verify that everything works, you may remove the installation file from the Downloads directory.