Downloads are聽saved on the 成人论坛 iPlayer app on聽the specific device you download them on, so they can鈥檛 be transferred to other devices.
If you change over to a new device, you won鈥檛 be able to copy your downloaded programmes. However, they will still be available to watch on your old device until their expiry date, or you can download them again on your new device.