If the EA is commercial, contact the developer. Some sellers offer an "open code" version for an additional fee. This guarantees a clean, working, and legal copy of the MQ4 file.
Even with these measures, remember: “There is no 100% security in this world, especially in Metatrader. If you care so much, don’t share it” . how to convert ex4 file to mql4
Costs range from $50 for a simple indicator to $500+ for a complex EA. If the EA is commercial, contact the developer
If you absolutely need the MQL4:
If you purchased the indicator or EA, the best approach is to contact the developer directly and request the MQL4 file. Some developers may provide it if you explain your need for customization, perhaps for a fee or under a non-disclosure agreement. B. Use Alternative Open-Source Indicators Even with these measures, remember: “There is no