Some popular tools for converting MQ4 to EX4 include:
An MQL4 source code file that contains the text-based logic for Expert Advisors (EAs), indicators, or scripts. These files are editable using MetaEditor EX4 (.ex4):
Open your MetaTrader 4 platform. Press the F4 key on your keyboard, or click the icon that looks like a book with a magnifying glass (MetaEditor) in the toolbar.
Using old MQL4 order handling in an incorrect context. Fix: Ensure you call OrderSelect() with a valid ticket number before reading order properties.