Have you checked that the there is a match possible between the suls_iptv_m3u4_channels.xml channelID and the data in the .gz file?
.gz is still supported and there is now error from your download.
The problem is in the setup between the channels list and this data file.
First of all, thank you for taking the time to reply to my topic.
So, I collected all these log files to share with you. I believe that they will be valuable for you to debug the problem.
suls_iptv_test.sources.xml
suls_iptv_test_channels.xml
twisted.log
Importing from hdd with SUCCESS
channel.m3u
#EXTM3U url-tvg="http://m3u4u.com/epg/z87jtvqgk5"
#EXTINF:-1 tvg-chno="1" tvg-id="BBCOne.uk" tvg-name="BBCOne" tvg-logo="https://s3.amazonaws.com/schedulesdirect/assets/stationLogos/s17153_h3_aa.png" group-title="Group Test",BBCOne
https://theblaze4.akamaized.net/hls/live//699982/theblaze/cm-dvr/master.m3u8
guide.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE tv SYSTEM "xmltv.dtd">
<tv generator-info-name="m3u4u" generator-info-url="https://m3u4u.com/">
<channel id="BBCOne.uk">
<display-name>BBCOne</display-name>
</channel>
<programme start="20200224234000 +0000" stop="20200225003000 +0000" channel="BBCOne.uk">
<title lang="en">The Graham Norton Show</title>
<desc lang="en">A compilation of highlights from the current series, featuring a host of stars.</desc>
</programme>
<programme start="20200225003000 +0000" stop="20200225003500 +0000" channel="BBCOne.uk">
<title lang="en">Weather for the Week Ahead</title>
<desc lang="en">Detailed weather forecast.</desc>
</programme>
</tv>
Edited by h0ttz, 28 February 2020 - 00:18.