The E0209 Sentinel Key Not Found error in Autodata 3.45 on Windows 7 typically occurs because the Sentinel protection driver is missing or the emulator failed to initialize correctly. Common Fixes for E0209 Error
Verdict
Disable UAC (User Account Control):
tool to enable this mode and sign the emulator's system file manually. Run the Emulator as Administrator : Locate the folder in the installation directory and run the E0209 Sentinel Key Not Found Autodata 3.45 Windows 7
How I tested / observed behavior (typical scenario) The E0209 Sentinel Key Not Found error in Autodata 3
Warning: Incorrect registry editing can break Windows. Back up first. E0209 Sentinel Key Not Found Autodata 3.45 Windows 7