It is not enough to update the aa-webui-launcher.jar. The launcher jar starts everything from the existing plugins folder and will show the old version even after the upgrade.
Environment
21.0.x
Resolution
Stop the AWI service
Take the backup of the Webinterface folder
Extract the zip file zip file Automation.Engine_Automic.Web.Interface_21_0_x+build.y.zip
Retrieve the following files from the backup files from the previous to the new config folder