On the Management Console, check the version number by clicking the About button located on the top of the page.
iPad POS Platform:
To check the POS version or build, double tap the Revel logo at the top of the login screen (where you enter your pin in the iPad POS Platform).
Checking the iPad POS or Customer Display System Version from the Management Console
You can also use the Management Console to look up Point of Sale and Customer Display versions. Navigate to the Establishment tab, and click Version Information in the left-side menu.
Kitchen Display System:
To check the KDS version or build, double tap on the Revel logo in the lefthand corner of the screen. A pop-up window will appear with the version information.