Use Python 3.x to run the extractor, as most modern PyInstaller bundles use Python 3.
: If the executable was corrupted during download or transfer, the internal structure may be broken, preventing the tool from finding the archive. Antivirus Interference Use Python 3
The top in the error message often refers to the (the main executable) vs. an embedded archive (e.g., extracted from a PYZ). The error can occur in these scenarios: the internal structure may be broken
If a developer wants to prevent decompilation, they might manually strip or modify the "cookie" bytes. PyInstaller look for the magic hex string MEI\014\013\012\013\016 . If even one byte is changed, the extractor will fail. the extractor will fail.