You probably installed and opened the wrong Lightroom. There are two versions: ‘Lightroom Classic’ (the Lightroom version that has been around for about 15 years, and is now at version 9.3) and just ‘Lightroom’ (now at version 3.3), also known as ‘Lightroom desktop’ or ‘Lightroom cloud’. This is the new application that stores images and edits in the cloud. Lightroom is not the successor of Lightroom Classic! Both are current, aimed at a different audience. Lightroom Classic has modules, Lightroom does not.