Concretely I've done the following:
sudo systemctl stop esets
sudo rm /var/opt/eset/esets/lib/*
sudo rm -r /var/opt/eset/esets/lib/data/updfiles/*
sudo systemctl start esets
Result in a a few minutes of downloading data (network load) etc with no terminal output followed by:
Job for esets.service failed because a timeout was exceeded.
See "systemctl status esets.service" and "journalctl -xe" for details.
sudo systemctl status esets
Results in the following terminal output:
● esets.service - ESET NOD32 Antivirus
Loaded: loaded (/lib/systemd/system/esets.service; enabled; vendor preset: enabled)
Active: failed (Result: timeout) since Mon 2020-11-23 10:50:16 CET; 1min 20s ago
Process: 5292 ExecStart=/opt/eset/esets/sbin/esets_daemon (code=killed, signal=TERM)
Nov 23 10:48:45 mertins007 systemd[1]: Starting ESET NOD32 Antivirus...
Nov 23 10:50:16 mertins007 systemd[1]: esets.service: Start operation timed out. Terminating.
Nov 23 10:50:16 mertins007 systemd[1]: esets.service: Failed with result 'timeout'.
Nov 23 10:50:16 mertins007 systemd[1]: Failed to start ESET NOD32 Antivirus.
Trying sudo systemctl start esets fails with the same message as above, but sudo systemctl status esets results in:
● esets.service - ESET NOD32 Antivirus
Loaded: loaded (/lib/systemd/system/esets.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2020-11-23 10:53:48 CET; 31s ago
Process: 5582 ExecStart=/opt/eset/esets/sbin/esets_daemon (code=exited, status=69)
Nov 23 10:53:44 mertins007 systemd[1]: Starting ESET NOD32 Antivirus...
Nov 23 10:53:48 mertins007 esets_daemon[5582]: error[15ce0000]: Cannot initialize scanner: Module init
Nov 23 10:53:48 mertins007 esets_daemon[5582]: error[15ce0000]: Cannot initialize scanner: Module init
Nov 23 10:53:48 mertins007 systemd[1]: esets.service: Control process exited, code=exited status=69
Nov 23 10:53:48 mertins007 systemd[1]: esets.service: Failed with result 'exit-code'.
Nov 23 10:53:48 mertins007 systemd[1]: Failed to start ESET NOD32 Antivirus.
So for me unfortunately no success for me.
Please let me know if I interpreted your instructions wrong and or how to proceed.