Jervais
The reason why it will not update is because you are running a trial version or there are no more updates.
Click on the "Gear" symbol in the upper right hand corner.
In that window click on "Upgrade" in the lower left corner.
In that window click on "Update" . If there is an update to be found, this is the best way of going about it rather then to try and guess which one applies from Cyberlink's update page.