I just purchased and set up a vivoactive. According to Garmin Express and the phone, the software on it is up-to-date (v4.30). But for almost all vivoactive apps in the Connect IQ store, I am receiving the message "This app requires an update of your vívoactive. Please use Garmin Express to update your vívoactive."
I bought this because of the apps. If I can't use most of them for some unknown reason, it's being returned.