This year Home Assistant depreciated the old Zwave integration so now you have to either be running the HASS.io image or the Supervisor version. If you have a manual install of Home Assistant or use the version that’s available in the dietPi package manager then you need to have a separate server running. Any chance one of these could be included in the available packages?
Z-Wave JS Server: https://github.com/zwave-js/zwave-js-server
ZwaveJS2Mqtt: https://zwave-js.github.io/zwavejs2mqtt/#/