frontend config wizard instructions do not mention possibility that webserver user has write access to conf/ (or how to set those) and thus could save config file without requiring manual download & upload of it.

step 6 in https://www.zabbix.com/documentation/2.0/manual/installation/install#installing_zabbix_web_interface and https://www.zabbix.com/documentation/2.2/manual/installation/install#installing_zabbix_web_interface