The version at MacPorts is 1.35, which I have installed, but it fails with:
> $* is no longer supported as of Perl 5.30 at /opt/local/bin/txt2html line 1587 The current version is 2.51, which can be downloaded from Sourceforge <https://sourceforge.net/projects/txt2html/files/>. Does txt2html have a maintainer (I don't know how to check that)?