In order to install this product you will need to download its corresponding setup executable to the computer you are planning to use this product on. After download is complete you should run this executable and follow instructions presented by setup wizard.
Note: Setup executable does not require internet connection at all - you may transfer the downloaded executable to any computer you need.
Version updates are handled in a similar way. You do not need to uninstall any previously installed version - just install the newer version over the existing one. You will not need to re-enter your registration details this way.