Beginning with Apple Configurator 1.3, you have two options for managing iOS software (IPSW files) manually.

 

Use the Edit Custom iOS Versions command

In Apple Configurator, hold down the Option key while choosing Devices > Edit Custom iOS Versions. You can then add or remove custom versions of iOS software, such as developer previews.

Any IPSW files that you add in this way will appear in the iOS pop-up menu in Apple Configurator.

 

Place the iOS software in the Firmware folder

Drag the IPSW file to the Firmware folder, located here:

~/Library/Containers/com.apple.configurator/Data/Library/Caches/com.apple.configurator/Firmware/

When you place an IPSW file in the Firmware folder, Apple Configurator does not download that version of the software from the Internet. However, if iTunes has already downloaded that version to the user's iTunes Library, Apple Configurator uses the version in the iTunes Library.