If you have the EX4 and understand what the bot does, you can hire a developer on the official MQL5 forum to rewrite the logic from scratch in a new MQ4 file.
ex4 decompilers on GitHub are powerful research tools that can reveal the inner workings of MT4 Expert Advisors, but they’re imperfect and situational. Expect readable reconstructions for many EAs, especially straightforward ones, while complex, optimized, or protected binaries will require hybrid static/dynamic methods and manual analyst effort. Use these tools responsibly: they’re invaluable for auditing, security research, and recovery—yet they carry legal and ethical responsibilities. ex4 decompiler github