This specific version (4.0.432) is part of a series of tools originally released by the team. It functions as a decompiler that translates the low-level byte code used by MT4 into a higher-level language that can be edited in MetaEditor.

This tool was designed for MT4 build 509 or lower .

For legitimate recovery of your own lost files, specialized MQL4 programming services may offer secure restoration for a fee. Ex4 To Mq4 Decompiler 4.0.432 | Updated - Google Groups

Decompiling commercial EAs to remove licensing or distribute them for free is considered illegal in most jurisdictions and a violation of copyright law.