Did you maybe not copy and paste the link from the uploader? Because what you’ve typed here is not a functional link. There’s no s or back slashes after http, and there are spaces between onslaughtfromrigel and 03, between 03 and pratt, between pratt and 128, and between 128. and mp3. All but the last of these should be underscores. And the kb after 128 is missing. If I put in the underscores where they should be, still nothing comes up. The total file name must be https://librivox.org/uploads/icequeen/onslaughtfromrigel_03_pratt_128kb.mp3. When you save your file in Audacity, make sure it’s saved as onslaughtfromrigel_01_pratt_128kb (Audacity will add the .mp3 at the end when you export the file).
Please upload your correctly named file to the uploader once more, then copy the blue link that appears after the green bar has finished moving across, and paste it into a post here. You must have done this successfully for your 1-minute test, so it’s exactly the same process.
Thanks,