With the reseed request message you get a link to the page of the torrent requested to be reseed. Click the "Download" button there, and you'll get the .torrent file again.
Then direct the download to the directory containing the data (movie) file you've got already and after a recheck your torrent client will start seeding it.
look for our guides there > https://forum.gaytorrent.ru/index.php?topic=6539.0