"This note is to inform you of the upcoming End-of-Sale (EOS) and End-of-Life (EOL) dates for the F-Prot Endpoint Antivirus products." https://www.cyren.com/f-prot-eol-announcement
It was a good choice, when MS-DOS was around, and was useful on early Windows versions. As a signature based AV, it does not cover today's threats. Now the company focuses on enterprise solutions.
I remember using it on Windows 3.11. It detected Michelangelo virus that could not be removed from within Windows but I managed to remove it from DOS. Those were times when having good signatures was the same as having a good AV. Over the years things have changed and they stopped developing their AV a long time ago. I doubt that many users will be impacted by this decision.
Ah the familiar name of a now relic of a once fine product many versions & years ago. I use to turn to it like others on Windows 98SE