Garmin states that the new beta software will be automatically installed on eligible units once they have synced with Garmin Connect Mobile (GCM) or via Garmin Express. Should you encounter any problems, the company asks that you log them in the forum's Bug Reports section. So far, only one issue has been reported for v19.15, where a user attempted to save lactate threshold data via a prompt asking them to 'skip' or 'save'. Despite hitting save, the data appears to have disappeared. The issue is listed as "Under Review" by Garmin.