<p>From 31 October 2024, BT Cloud has <a href="https://www.bt.com/help/broadband/bt-cloud/getting-set-up/download-or-access-files/how-do-i-download-files--folders-and-devices-from-bt-cloud-">closed</a> and all data will soon be deleted.</p>
The bit you're missing is that the careline units no longer use the phone line, so upgrade can be done no issues. Just need to persuade Openreach there's no longer any restriction on a flat by flat basis!