aria2c "${URL}" --follow-torrent=false
De manual do aria2 :
--follow-torrent=true|false|mem- Iftrueormemis specified, when a file whose suffix is.torrentor content type isapplication/x-bittorrentis downloaded,aria2parses it as atorrentfile and downloads files mentioned in it. Ifmemis specified, atorrentfile is not written to the disk, but is just kept in memory. Iffalseis specified, the.torrentfile is downloaded to the disk, but is not parsed as atorrentand its contents are not downloaded.
Default: true