You should always ensure you are using the latest version before a drop. Check the version number in the bottom left of your bot matches the latest version in the #updates channel.
To update, simply uninstall the old version, and reinstall the new version. All of your settings and data will persist.
To update, simply replace the old version with the new version by dragging the new version to Applications.
Click "Replace" when prompted. All of your settings and data will persist.