Updating VAHR to 3.50?

So the Garmin Connect webpage keeps telling me that there's an update available for my VivoActive HR:

vivoactive HR, Version 3.50

In the past such updates automatically appeared on my VAHR after some time, I'm assuming as a result of using the Garmin Connect app on my L950. However, this time around it hasn't happened and it's been quite a while... has anyone else noticed this? Any tips to get it to update other than installing Garmin Express on my PC?