It could be that your payment hasn't been received and your subscription has been cancelled by Paypal. This could be due to a card expiring, lack of funds etc. Please check your subscription is still active by logging on to your Paypal account and going to the history tab.
If the subscription is cancelled, when you have resolved this issue with Paypal, uninstall our existing software, restart your machine and then resubscribe/install as you did last time.
If this doesnt work please send us the connection log and we can check the connection is working. Click on the small icon to reveal the log.