Restricting Access by OS Build Number
From the Connection category > Allowed Devices tab you can configure what version the client software should be running to be able to access the system. To restrict such rules, enable the option Allow connection from these clients only.
Connection Category - Allowed Devices Settings
To enable or disable a specific client, tick or untick the tick box next to its name. To modify the build number, highlight the client name in the list and select Edit from the Tasks drop down menu.
By enabling this option the build number of the client software will be checked and if the build number is lower than the configured one, the client will be receive an error as seen in the screenshot below.
Error received by the client when using an older build than the one configured