Converting EX4 to MQ4 for free is a difficult task.
If you need to edit an EA or indicator, here is the recommended workflow: how to convert ex4 to mq4 free upd
This write-up explores the technical reality, the free methods (such as they are), the significant risks, and the ethical alternatives to converting EX4 to MQ4. Converting EX4 to MQ4 for free is a difficult task