This app unlocks all the features in BlueHome. You must have BlueHome (free) installed on your phone. This app just acts as a license key to remove the device limit in BlueHome and to enable additional features such as export/import of your configuration to other devices.
After installing this, you can start the full (unlocked) version of BlueHome by clicking tapping either the original BlueHome or the new BlueHome Unlocker icon in your App drawer. You can check that you have the full version by pressing Menu > About: it should say "BlueHome vX.X Full".
This Unlocker will keep unlocking all future version of BlueHome.