Kodi 18 addon stops - with server v2.2.1

[urisavor]

I am using v2.2.1 which is the last version I can use on WHS (windows 2003 server), 32 bit.
Latest kodi update broke the Argus client - seems "keep alive" is not working.
Kodi log shows:
16:37:20.641 T:2652 ERROR: CCurlFile::FillBuffer - Failed: HTTP returned error 500
16:37:20.642 T:2652 ERROR: CCurlFile::Open failed with code 500 for http://192.168.1.6:49943/ArgusTV/Control/GetLiveStreamTuningDetails:
16:37:20.642 T:2652 ERROR: AddOnLog: ARGUS TV client: can not write to http://192.168.1.6:49943/ArgusTV/Control/GetLiveStreamTuningDetails
16:37:25.067 T:10476 ERROR: CCurlFile::FillBuffer - Failed: HTTP returned error 500
16:37:25.067 T:10476 ERROR: CCurlFile::Open failed with code 500 for http://192.168.1.6:49943/ArgusTV/Control/KeepLiveStreamAlive:
16:37:25.067 T:10476 ERROR: AddOnLog: ARGUS TV client: can not write to http://192.168.1.6:49943/ArgusTV/Control/KeepLiveStreamAlive
16:37:26.167 T:2652 ERROR: CCurlFile::FillBuffer - Failed: HTTP returned error 500
16:37:26.167 T:2652 ERROR: CCurlFile::Open failed with code 500 for http://192.168.1.6:49943/ArgusTV/Control/GetLiveStreamTuningDetails:
16:37:26.167 T:2652 ERROR: AddOnLog: ARGUS TV client: can not write to http://192.168.1.6:49943/ArgusTV/Control/GetLiveStreamTuningDetails
16:37:31.697 T:2652 ERROR: CCurlFile::FillBuffer - Failed: HTTP returned error 500
16:37:31.697 T:2652 ERROR: CCurlFile::Open failed with code 500 for http://192.168.1.6:49943/ArgusTV/Control/GetLiveStreamTuningDetails:
16:37:31.697 T:2652 ERROR: AddOnLog: ARGUS TV client: can not write to http://192.168.1.6:49943/ArgusTV/Control/GetLiveStreamTuningDetails
16:37:35.149 T:10476 ERROR: CCurlFile::FillBuffer - Failed: HTTP returned error 500

etc...