This error is rarely a bug in PyInstaller itself but rather a failure of to parse a specific binary. If updating the extractor fails, the binary likely has a modified signature designed to resist extraction.
: The file might not actually be an executable created by PyInstaller (e.g., it was created by Nuitka, cx_Freeze, or is a native C++ binary). Insufficient Permissions This error is rarely a bug in PyInstaller
# Search for MEIPASS2 (older) or newer magic signatures = [b'MEIPASS2', b'MEIPASS'] for sig in signatures: idx = data.rfind(sig) if idx != -1: print(f"Found cookie at offset: idx") # Parse length (usually the next 4/8 bytes) cookie_len = struct.unpack('<I', data[idx+len(sig):idx+len(sig)+4])[0] print(f"Cookie length: cookie_len") return idx print("Cookie not found") return -1 it was created by Nuitka