STEP 1: Download the app you require via iTunes in the normal way, this includes paid apps
STEP 2: Open Apple Configurator and select the Supervise tab
STEP 3: In the right panel select the Apps tab at the top of the screen.
STEP 4: Initially the Apps panel will be blank. To add the applications you wish to install, click the + symbol at the bottom of the page and navigate to the following location to find the apps you downloaded in iTunes:
Mac HDD > Users > Your User Name > Music > iTunes > iTunes Media > Mobile Applications
The Apple Configurator Apps list should now be populated with the apps you wish to install.
STEP 5: Connect your iPad or iPads to your Mac with the standard Apple USB cable. If you don’t have enough USB ports on your Mac you can use a USB hub. Many iPad trolleys and cases come with a powered USB hub built in.
STEP 6: Your iPads should appear as connected in Apple Configurator.
STEP 7: In the device list select the device or devices you wish to install the app on. If you want to install the app on all devices select “All iPads” at the top of the list.
STEP 8: Tick the application(s) you wish to install in the App list
STEP 9: Click the Apply button at the bottom of the screen
Your apps will now install on all connected iPads.