On "big" updates you can choose on installation that you can want to keep the old version.
This can be important if you work on bigger projects that has to be finished in the older version. Or you'll check the new version if it's work as you like or it's compatible with plugins that you're using.
If all works fine you can deinstall the older version via the Creativ Desktop Client.
My System: Intel i7-8700K - 64GB RAM - NVidia Geforce GTX 1050 Ti - Windows 10 Pro 22H2 -- LR-Classic 12.3 - Photoshop 24.5 - Nik Collection 6 - Topaz Sharpener AI