If you purchased the EA, the original developer may provide the source code for a fee or help you with a specific modification.
Modern EX4 files are heavily encrypted. "Old school" decompilers that worked pre-2014 no longer function on current files. ex4 to mq4 decompiler 50 1 exe
Most commercial EAs come with a license agreement that explicitly forbids reverse engineering. Using a decompiler to bypass licensing or steal intellectual property can lead to legal consequences or being banned from trading communities. Are There Alternatives? If you purchased the EA, the original developer
If you are looking for a decompiler because you lost your own source code, there are a few safer routes: If you purchased the EA
is the compiled version. This is the executable file that the MT4 platform actually runs.