The best long-term solution is to learn to code your own EAs. MQL4 is similar to C and is not difficult to learn for basic strategies. Free resources:
A: Technically, yes, but you still face the technical hurdles. Use a reputable paid decompilation service and provide proof of authorship. Do not risk free tools. Free Ex4 To Mq4 Decompiler Zip
Modern EX4 files contain checksums that MT4 verifies at load time. If a decompiler modifies the bytecode to make it readable, the checksum breaks, and MT4 will refuse to load the recompiled MQ4. The best long-term solution is to learn to code your own EAs
A: That is still a copyright violation unless the EA is explicitly open-source. Instead, find open-source EAs on GitHub or MQL5 Code Base that share similar logic. the checksum breaks