Note: Please make sure that you're using the latest version to avoid installation issues. You can download the latest version of your products from your Account. You may also import past purchases after signing up for an account to access the latest updates.
Download the installer for your operating system from your account.
Now run the installer as administrator. MAC installers are .app files, Windows installers are .exe files. Make sure that ALL files from the .zip archive are in one folder when attempting to run the installer and that you have administrative rights on your system.