If you are looking for a way to modify an indicator or EA without the source code, consider these options: Use iCustom:
are often used to find freelancers who can manually reverse engineer the code. Alternatives to Online Conversion Contact the Developer:
: If you purchased the EA, the developer might provide the MQ4 file for a fee or as part of a support agreement.
Converting these files back (decompiling) has become significantly more difficult due to platform updates: Old Builds (Before 600)