Many files labeled as "decompilers" in the trading community contain malware or "backdoor" Trojans. Always run these files in a Virtual Machine (VM) or a Sandbox environment before using them on your main trading PC.
According to release notes and user reports, the v4.05 decompiler introduces: ex4tomq4 v4 decompiler version 405 full upd
Instead of risking your PC’s security with "v405" decompilers, consider these safer paths: Many files labeled as "decompilers" in the trading