From the Video Portal
You can download a transcription file (which will have all of the timings and formatting of the subtitle file removed) on the Video Portal by clicking on the ‘Options‘ button under the video and selecting ‘Download transcription‘. This will save as a text file (with the .txt extension).
From the embedded video player
Click the download icon in the player controls and choose the ‘download transcript (.txt)’ link. The file will be saved in the .txt format.