Station uses a silent update method that should be transparent for the user:
Every 30 minutes we check if a new update is available.
If there's one, we download the new version in the background.
When the download is finished we install the new version silently.
Upon next Station restart, the update is finished and the "What's New" panel automatically pops-up.
- - - - -
Nevertheless, if you wish to manually force an update just:
Open the preferences pane from the top bar menu or using the keyboard shortcut Cmd/Ctrl + ,
Click the "Check for updates" button in the "General" section