The text files are M3U8 playlist with an expiration date of 24 hours. So, if the content was imported i.e. in 18th July, you have 24 hours to download it using VLC or yt-dlp. If the link expires, you won't be hable to download it, unless you flag the video and hope for the best for the importer bot to re-import it again. This is frustrating, but beggars can't be choosers.
For more info see
>>20989 (this section should ve moved to the main site IIRC, almost no one uses the board to "inform" themselves.)