There is rarely a "one-click" .exe that can unpack every Enigma 5.x file. Instead, "unpacking" usually refers to a combination of automated scripts and manual reconstruction. 1. Finding the OEP (Original Entry Point)
Understanding Enigma Protector 5.x and the Evolution of Unpacking
The "meat" of the original program is often moved into a VM. An unpacker cannot simply "dump" the process from memory because the original x86 instructions no longer exist in their native form.
Ensuring the file cannot be modified without breaking the signature.