What other support is there when the Forum doesn't deliver?

Thank you. The error changed.
What is showing now is a permissions error -
Error 13 EACCES Permission denied

Jan 03, 2020 10:48:58.968 [0x7fb2abfff700] INFO - [I] v4l::DeviceGetList_impl. getting v4l device list
Jan 03, 2020 10:48:58.978 [0x7fb2abfff700] WARN - [E] v4l::DeviceGetList_impl. open failed on frontend /dev/dvb/adapter0/frontend0 (13)
Jan 03, 2020 10:48:58.979 [0x7fb2abfff700] WARN - [E] v4l::DeviceGetList_impl. open failed on frontend /dev/dvb/adapter1/frontend0 (13)

There is a forum post here wintv-dualhd not working properly with Live TV - #2 by keithah which mentions

Try doing ‘sudo usermod -a -G video plex’ to give the plex user access to the video group, which is likely where /dev/dvb/adapter1/frontend0 lives and you should be good to go.

Could you look into this. The command is mentioned on this web page