Sometimes, there will be regular updates on the product. When you will found out there is a new updated version, you need to update the plugin.
You can update the plugin in two different easy ways.
In a first way, go to Plugins > Installed Plugins page, there you will see the warning notification bar in the bottom. Press the link update now to update the plugin.
In a second way, go to Dashboard > Updates.
Among all updates on this page, scroll down up to Plugins and find a necessary plugin to update.
Click the checkbox of which plugin you want to update, then click on the Update Plugins button above.