The physical dongle is not receiving power or the computer is not recognizing the USB device.

Autodata 3.45 is a legacy product. This guide is for educational purposes for existing licensed users or those restoring previous installations. If you'd like, I can:

A significant historical cause of this error was the transition from 32-bit to 64-bit Windows.

Right-click the Autodata desktop shortcut and select . Go to the Compatibility tab.

It seems you're looking for a review or troubleshooting insight regarding the error message in Autodata (a popular automotive repair and diagnostic software).

Run the installer as an administrator and follow the on-screen prompts to complete the installation.

The "Sentinel key not found" error is a frequent and frustrating issue encountered by automotive technicians and workshop owners using Autodata software. This error explicitly indicates that the software cannot communicate with its hardware security dongle (the Sentinel USB key) or validate its digital license. Without resolving this connection failure, the application will refuse to launch, halting workshop operations.

Before diving into the solutions, it helps to understand why the connection between Autodata and the Sentinel runtime breaks:

Disclaimer: This guide is for educational purposes regarding software licensing and hardware communication. Always use legally licensed software. If you'd like, I can:

Once you have resolved the issue, follow these best practices to avoid encountering it again:

The background service ( HASPLoader ) responsible for managing the security key has stopped running.

When Autodata displays this error, it is usually due to one of three things: Hardware Connection: