Tvheadend

Hi,

I'm unable to update from 2009 version, because of the following errors in apt-get upgrade command:

Err:1 http://apt.tvheadend.org/unstable focal/main amd64 tvheadend amd64 4.3-2010~g3b1d7a928~focal
404 Not Found [IP: 104.21.22.193 80]
E: Failed to fetch http://apt.tvheadend.org/unstable/artifacts/9b/2a1nry0i/tvheadend_4.3-2010~g3b1d7a928~focal_amd64.deb 404 Not Found [IP: 104.21.22.193 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

My /etc/apt/sources.list.d/tvheadend.list file is:

deb [arch=amd64] http://apt.tvheadend.org/unstable focal main

It seems that files are missing in the repo. Anyone with the same issue?

Thank you.