I do not know how to fix it then. I renamed one plugin in the MT4 to ZorroMT42.dll. And I also did the same in the Zorro Plugin Folder. So now one MT4 has ZorroMT4.dll and the other MT4 has ZorroMT42.dll. And in the Zorro Plugin Folder are to dll's: ZorroMT4.dll and ZorroMT42.dll. But now I get an error message when I load the ZorroMT42.dll on the chart of MT4. See the attachment foor the error messages. This is the error message when I try to load the Zorro EA on a chart in the MT4 in which I renamed the dll to ZorroMT42.dll