If you must test a file, run it in a secure environment like the Hybrid Analysis Sandbox or a dedicated virtual machine.
: Decompiling software you do not own may violate intellectual property rights and end-user license agreements. Verdict Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version
Many sites claim to have a "Version 4.0.5" that works on modern builds, but after downloading, the software either doesn't run or produces "garbage" code that cannot be compiled. If you must test a file, run it
I do not condone piracy, but as an informational article, here is where such files are typically found (use at your own risk): If you must test a file