Microsoft Defender SmartScreen may display a warning when launching a newly released ExtendSim installer because Windows has not yet established sufficient reputation data for that specific installer. This can occur even though the installer is digitally signed and verified by ANDRITZ Inc.
When the warning appears, you should see ANDRITZ Inc. listed as the publisher rather than Unknown Publisher. This confirms that the installer has been digitally signed and has not been altered since it was released.
Unfortunately, SmartScreen reputation is controlled by Microsoft and is based on factors such as download history and user adoption. Because of this, newly released versions of ExtendSim may temporarily trigger a SmartScreen warning for some users. As more users download and run the installer, the warning typically becomes less common.
If you downloaded the installer directly from the official ExtendSim website and the publisher is identified as ANDRITZ Inc., it is safe to proceed with the installation.