Congratulations on your new device!
You have two choices to reenable BlindSquare, restoring from backup or “a fresh start”.When restoring device from backup BlindSquare, and all its settings, are installed automatically.
When performing a fresh start, and using the same Apple ID, “buy” app from App Store again. You will get a notification saying, that the app was previously purchased and you qualify for a free download. Following the download, your settings will be restored from iCloud.