Annoying message since 4.3 update!

I have just renewed my licence and updated to v4.3 on my main site. I use this theme on many other sites and previously just update from the downloaded version. When I go to do this now I get the message "Please active license key for Catch Fullscreen Pro theme. Enter the license key here for the best results." I have no problem being reminded of this, but there is no x to remove/close the message, so it is there the whole time. Please advise how I can remove it.