Use the current download route
Older TED blog posts about website downloads can still appear in search. The current help page supplies the applicable route: the iOS or Android mobile app. Start from that guidance rather than assume an old web-page menu remains available. Check the official publisher when installing the app.
For an illustrative trip plan, choose the talk in the app and keep the title in a short travel list. Do not assume that bookmarking a talk also saves it offline. A saved reference and a completed local copy are different states, and only the latter is relevant when planning to watch without connectivity.
Confirm completion on the intended device
The help describes a progress circle during transfer and a checkmark at completion, with the item also listed under the profile’s Downloads folder. Check the final state rather than leave the app after seeing the transfer begin. If you intend to use another device, inspect that device’s own download state instead of assuming the file follows the bookmark.
Before departure, open the intended downloaded talk within the app and check the portion and subtitle option you need. Check it on the device that will travel with you. If mobile downloads are blocked, consider the app and device cellular-data permissions as described by TED, and make a deliberate choice about data usage.
Do not troubleshoot it as a missing export
The publisher explicitly says the offline file is usable only within the app environment. Searching a general file manager for an MP4 or trying to import the item into an IPTV player is therefore the wrong expectation for this function. Retain the app’s download entry as the place to manage the copy.
If an item marked complete still fails offline, record the talk, device, app version and exact message for an official support enquiry. Keep incomplete transfer, absent export and failed offline playback as separate observations. Keep the item within its supported app environment when following the publisher’s offline instructions.
Questions about this guide
Can I copy the offline TED item to another media player?
The publisher describes the copy as usable only inside the app, rather than a standalone exported video.