you can change settings to help lower spec systems: when a host is open press the BLUE button for MORE & change active movie player to without buffering.
Copied from their page: (may have already be included in the latest update)
PyCurl Information / Installation Instructions
This package solves problems with HTTPS connections on some older Enigma2 images and fixes problems with HTTPS servers requiring TLS 1.3. Once the package has been installed you must tell E2iStream to use PyCurl for HTTP(S) requests from the configuration page. If you are getting HTTPS related errors then you need to install this package.
Open up a Telnet client or use the built in terminal from your browsers OpenWebif, issue the following command:
cd /tmp && rm -f pycurlinstall && wget
http://softrix.co.uk/istream/precompiled/pycurlinstall && python pycurlinstall
FFMpeg Information / Installation Instructions
For video related issues such as the Access Denied - Error code error etc. you need to install a newer version of FFMpeg. This happens on older boxes such as the ZGemma H.2S. i55s and newer seem to be ok.
Open up a Telnet client or use the built in terminal from your browsers OpenWebif, issue the following command:
cd /tmp && rm -f ffinstall && wget
http://softrix.co.uk/istream/precompiled/ffinstall && python ffinstall