Information about DEX can be obtained by using the 
button from the Home tab of the ribbon menu.
This will display the About DEX Design Express dialog below
About DEX DEX Design Express
The build version is displayed towards the top right of the dialog. In this case DEX was built on the 3rd. February, 2012 at 9.45 GMT.
View Installation Directory - Displays the file location where DEX has been installed. This includes the program itself, all supporting assemblies and this help file.
View Data Directory - Displays the file location of the local database of parts.
View Settings Directory - Displays the file location of the settings files for DEX
Clicking OK closes the dialog box and clicking on the Help button shows this help topic.