Updating the JCE Content Editor
Special mention here for this popular 3rd party extension.
You will be notified of the availability of an update via the Extensions > Manager > Update screen, as for most other popular 3rd party extensions.
But if you are using JCE Content Editor PRO to take advantage of the suite of JCE Addon Plugins published by the JCE developer (for example: Image Manager Extended), you will need to open the Components > JCE Content Editor screen to check for any updates.
JCE Addon Plugins will be listed in JCE's own Extension Updater screen when they are available.
Perform a FULL backup of your website (database & files) before you update Joomla! extensions.
Extension updates can potentially break your website.