See #6158
http://www.zengatv.com/
http://www.zengatv.com/live.html
http://www.zengatv.com/latestLive.html
Streams are broken, plugin hasn't been updated in ages:
https://github.com/streamlink/streamlink/commits/6.10.0/src/streamlink/plugins/zengatv.py
Their site also doesn't support HTTPS/TLS connections, so it's already a joke of a site and not worth having a plugin implemented for.
$ streamlink --http-timeout 60 http://www.zengatv.com/live.html
[cli][info] Found matching plugin zengatv for URL http://www.zengatv.com/live.html
[plugins.zengatv][error] No video id found
error: No playable streams found on this URL: http://www.zengatv.com/live.html
$ streamlink --http-timeout 60 http://www.zengatv.com/live/ccde6348-a376-494e-9883-dc516eda4ab0.html
[cli][info] Found matching plugin zengatv for URL http://www.zengatv.com/live/ccde6348-a376-494e-9883-dc516eda4ab0.html
error: Unable to open URL: http://d1hya96e2cm7qi.cloudfront.net/Live/_definst_/amlst:sweetbcha1novD591L720P/playlist.m3u8 (504 Server Error: Gateway Time-out for url: http://d1hya96e2cm7qi.cloudfront.net/Live/_definst_/amlst:sweetbcha1novD591L720P/playlist.m3u8)