Hello everyone,
If you are experiencing an issue where the Simlink process does not close automatically during an update, please follow the steps below to adjust your Windows Security settings and resolve the old Simlink app closing issue.
First, ensure that the “Block Downloads” option is disabled in your security settings Windows Security -> App & browser control -> Reputation-based protection.
Note: You can only find this setting after enabling Reputation-based protection. To do this, go to Windows Security -> App & browser control. If Reputation-based protection is not Turn On then you no need to do anything.
After you have adjusted the Windows settings, please restart the Windows system and start the Simlink application. If you receive an update notification from Simlink, please download the latest version and run the installer.
Thank you! 
If you encounter any further issues, please feel free to reach out to us.
Best Regards,
Vishal Ahir
Navigraph