How to update the Twixl Publisher application?

When the Twixl Publisher macOS app starts up, it checks whether an update for the application is available.
If an update for the app itself is available, it will display the release notes and offer to download it.
You can also manually select "Check for updates…" from the Twixl Publisher application menu.
Check system components…

When the Twixl Publisher macOS app starts, it also checks the status of several components, and will report if a component needs to be installed or updated.
It will display information about the following checks:
- Whether the Twixl Publisher plug-in is up-to-date, and if it is not, you can update it
- Whether the Twixl Publisher Helper background application is up-to-date, and if it is not, you can update it
- Whether the iOS SDK (part of Xcode) is installed (required for iOS simulator previews and app builds) - if it's not, the "Install" button will link to Xcode in the Mac App Store
- Whether the Android SDK is installed (required for Android app builds) - if it's not, the "Install" button will allow you to download it
If all components are up-to-date, the Twixl Publisher app will automatically go to the main screen.