IPTVsimple m3u8 webadres support fails



After some tests with local IPTV companies which all uses specific apps, currently testing a more generic IPTV subscription service.
However as I only have experience with tvheadend++ (and some bad experiences with widevine on linux–), I am facing some challenges with getting IPTV simple running.

I understand that I need to configure an instance for my client. Which I did, however I cannot find support if the m3u8 weblink is supported by IPTV.

The format of the link:
http://xyz.com/get.php?username=test&password=test&type=m3u&output=m3u8

My logs keep showing the following error:

Select error in log:
2024-10-09 15:37:19.771 T:12152    info <general>: Loading skin file: DialogAddonSettings.xml, load type: KEEP_IN_MEMORY
2024-10-09 15:37:25.715 T:26800   error <general>: CCurlFile::CReadState::XFILE::CCurlFile::CReadState::FillBuffer - (0x1282b889160) Failed: Timeout was reached(28)
2024-10-09 15:37:25.715 T:26800   error <general>: CCurlFile::XFILE::CCurlFile::Open - <http://xyz.com/get.php?username=test&password=test&type=m3u&output=m3u8> Failed with code 0:

When I use VLC to extract the m3u it works (open network stream -> paste the URL -> triangle near open to select convert -> then select location -> and download. So access and download works.
When I open the link in a browser the m3u is downloaded. When I use m3u_plus I also am able to download.
Could the reason for the failure ben that the file is too big for kodi (or teh supplying sevrer to slow) as this file is 150megabyte big (the plus file).
So far the link to the file is not wokring, wil try to load the file and see what happens.

However it does not seem to work in IPTV simple.
Any ideas?

Also when I configure IPTV, I suspect that when I click “Open” in the addon on the left side, it should open. As far as I have seen on picture online, however this stays greyed out. Additionally based on some other readings to use with Kodi Live TV I should use IPTV manager.
When installed this obviously does not work either. 1 and 2 might be related, but so far it is not easy peasy (when I started with tvheadend it was a similar process, so no worries, hope to find some help here).

And lastly, I downloaded the IPTVsimple revision which was advised here on the forum, because in the windows version (freshly downloaded) it was referring to the wrong revision. Therefore not installing.