If you bought the EA, the developer might provide the source code for a fee or as part of a support agreement.
Because decompilers exist in a legal gray area, many downloads for "Ex4 To Mq4 Decompiler 4.0.401.1 43" are actually trojans or keyloggers designed to steal your trading account credentials. Ex4 To Mq4 Decompiler 4.0.401.1 43
: Decompiling someone else's EA or Indicator usually violates the software's License Agreement and intellectual property rights. If you bought the EA, the developer might
(February 2014). Modern builds use advanced compilation techniques that transform byte code into binary code, making simple automated decompilation nearly impossible. Code Quality (February 2014)
The is largely a relic of the past. While it was a powerful tool for older versions of MetaTrader, it is mostly ineffective against modern files and poses a significant security risk to your computer. For modern trading needs, focusing on learning MQL4 or hiring a developer to recreate a strategy is a much safer and more productive use of time.