[lproven]

I believe that's how the author earns a living: the software is free (and has online help), but the manual costs money.

[qwertox]

Oh, ok, I thought it was bundled with the download.

[lproven]

I went looking into this a bit and TBH I think I'm out of date.

I think he sold printed dead-tree manuals.

Now PDFs are bundled:

https://www.pmail.com/manuals.htm