Hi, I have same problem after updating today on my Asus tablet. I have tried uninstalling app and reinstalling it but it just says unable to connect, check internet connection, error 2.1. On the app page before installing it says that this app may not be optimised for your device. Have complained to Avast but they are pretty useless I find in replying to queries, sometimes they take days to reply too. Sorry I can't help. Pretty frustrating when you have paid for a service and then can't get it. The vpn was fine before this update.