Most EX4 files are the intellectual property of their developers. Decompiling them without permission violates copyright laws in most jurisdictions (e.g., DMCA Section 1201 in the US, EU Copyright Directive).
Old decompilers could easily extract .mq4 code from old .ex4 files. Modern .ex4 files are highly encrypted and optimized. convert ex4 to mq4 online free fix
Contact the original seller or developer. Many will provide the MQ4 for a small fee if you prove purchase. Most EX4 files are the intellectual property of