Reverse-engineering commercial software often violates the Terms of Service (ToS) of the developer and the MQL5 Market. What Should You Do Instead?
If you have the EX4 and want to replicate its behavior, hire a programmer to "black-box" the logic. They can watch how the EA trades and rewrite the code from scratch. This ensures you have a clean, modern MQ4 file. Ex4 To Mq4 Decompiler Github
Are you looking to a specific strategy, or are you trying to recover a lost project of your own? Ex4 To Mq4 Decompiler Github