Instead of decompiling, run the EA on a demo account and analyze its behavior:
Using free EX4 decompilers is not without significant risks and practical limitations. Free Ex4 To Mq4 Decompiler Software Applications
Free EX4 to MQ4 decompiler software applications are for accessing protected trading algorithms. They have severe technical limitations, significant legal and ethical implications, and considerable security risks. The most practical, legal, and safe approach is to: Instead of decompiling, run the EA on a