Hello! I am currently using the STAAD. Pro V12 and I just figured out that there is the latest build of STAAD.Pro which is 2023.
To install STAAD.Pro 2023, you need to download the installation file from here: https://softwaredownloads.bentley.com/en/ProductDetails/1562Once a new update of STAAD.Pro 2023 is released, you can update it by using the CONNECTION Client.
Just to answer the last part of your question, you need not uninstall V22. You can install STAAD.Pro Connect Edition V22 update 12 and STAAD.Pro 2023 in a same system simultaneously.