Time required: 10–40 hours per EA. Success rate for modern EX4s: Under 5%.
If you compiled the EX4 yourself but lost the MQ4, and you did not check "Disable decompilation" in MetaEditor settings: how to convert ex4 to mq4 free work
Steps:
Note: This only works on very old builds (before build 600) or unprotected files. Time required: 10–40 hours per EA
Many developers sell the source code at a premium (e.g., $199 for EX4, $499 for MQ4). If you explain your need (bug fix, personal optimization), they may negotiate. If you compiled the EX4 yourself but lost