Stuck still on 4.15.0 after updating to 4.18 Why?

Hi, Have updated 4.15.0 to the latest version.
Downloaded the updater from the site. installer 6.7.0
I launch unreal but it still saying 4.15.0 why?

Click the little down arrow V by the launch button. It’ll default to the last one you’ve used.

Hi, How does that gets me to 4.18.0, I just say 4.15.0?