Download and install the latest version.
Within the Installer there is nothing further to be considered. This is a modern DotNet program and it doesn't make any changes to your system. It can be safely uninstalled from the Control Panel.
The language in the SetUp refers only to the Setup program. Choose your language later in the program from the main menu Extras|Language.
Simply install a new version over your existing, best into the default directory. The program has to be closed before.