Those instructions were a bit inaccurate but when you want to convert old WMS settings to new, start mapsi when old settings file is named 'wms_settings.ini' (so no '-old' extension ). Then when mapsi is started it should backup that old settings file to 'wms_settings.ini-old' and when it is closed it should save settings in new format to 'wms_settings.ini' and 'map_settings.ini'.