In your Pickware account, you can manage which iOS devices are connected to your Pickware Admin. One device can be connected per booked license of WMS or POS.
If you see a message when setting up a new iOS device stating that no free licenses are available, you can view the devices connected to your shop in your Pickware account under Shop → POS or WMS under the entry Geräteverwaltung (Device Management), and remove them if needed to make room for new devices.