I have searched the Web but am unable to get a link to the torrent file for TeXLive 2019.
This appears to be a frequent problem since I found a similar question about TexLive 2018: Where can I get the TeXLive 2018 torrent file?.
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You can browse https://www.tug.org/texlive/files. There you'll find
.torrent files for TeXLive from 2009 all the way to the current one.
TeXLive 2019, specifically, is at https://www.tug.org/texlive/files/texlive2019-20190410.iso.torrent and TeXLive 2020, at https://www.tug.org/texlive/files/texlive2020-20200406.iso.torrent.