Politely explain that you lost the source code. Many developers (especially on Upwork or Fiverr) keep archives and will send you the MQ4 for a small fee ($10–$50).
The output is to the original MQL4. However, a good decompiler can produce functionally equivalent code—meaning the EA will trade identically, even if the internal variable names are gibberish. ex4 decompiler github
To understand the decompiler landscape, one must first understand the file format. When a developer writes code in MQL4, it is human-readable text. However, MT4 cannot execute this text directly. The MetaTrader compiler converts this text into bytecode—a lower-level, intermediate representation that the MT4 virtual machine can process efficiently. This .ex4 file is optimized for the machine, not the human. Politely explain that you lost the source code
Instead of hunting for a "magic" GitHub repository, consider these options: However, MT4 cannot execute this text directly
~320 Language: C# Last Update: 2024
or older were essentially byte-code that could be reverted with high accuracy. Purebeam's Decompiler: