This does give you an MQ4 file. It gives you a runtime map. You could then rewrite the EA from scratch based on what you observe. It is free, but requires Assembly language knowledge.
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These files used a simpler byte-code compilation. Tools like EX4-TO-MQ4 Decompiler 4.0.432 can often decompile these for free. How To Convert Ex4 To Mq4 Free
Surprisingly, this is the most effective "free conversion" method today. This does give you an MQ4 file
Converting modern MetaTrader 4 (Build 600+) EX4 files to MQ4 is generally impossible, as free, automated "decompilers" are often scams or malware. Legitimate options are limited to using the iCustom() function or seeking the original source code, rather than attempting to convert compiled files. For a detailed discussion on the risks, see the community discussion at Forex Peace Army . I can't find proper "old" "ex4 to mq4 decompiler"? It is free, but requires Assembly language knowledge