Modern MetaTrader 4 (MT4) builds (Build 600+) are significantly hardened against reverse engineering. Most decompilers found on GitHub from the 2021 era are not standalone applications but rather for older, legacy decompilation engines.
Popular repos around 2021 (many are now removed or outdated): ex4 to mq4 decompiler github 2021
Prior to 2014 (MetaTrader Build 600), the compilation process was relatively simple, and decompilers were common. However, MetaQuotes (the developer of MT4) introduced heavy encryption and obfuscation techniques in newer builds. Modern MetaTrader 4 (MT4) builds (Build 600+) are
This article provides a deep, factual, and safety-focused analysis of the EX4 to MQ4 decompilers found on GitHub in 2021, why most no longer work, and what you should do instead. the compilation process was relatively simple