You can check for updates to WHMCS from within the Admin Area.
Before you update your WHMCS installation, we recommend several preparatory steps.
You can set a maintenance message to display while you update WHMCS.
You can set a directory to use to stage files for updates.
You can configure the update channel to use for WHMCS updates.
You can update manually using your preferred browser.
You can update manually using the installation script on the command line.