The version number, and the availability of an update, can be determined within the browser itself.
For Windows users, start LockDown Browser, select the “i” button from the toolbar.
The version will be displayed and you can also click on “Check for Newer Version”. If a newer version is available, you'll have the option to download and install it.
For Mac users, start LockDown Browser and then select “About” from the toolbar. The version will be displayed as shown above, and you can click “Check for Update" to see if a newer version is available.