When installing or upgrading the Boring Server, the installer gets stuck on the installation of the .NET prerequisite of 6.0.11 or 6.0.26 with the message:

One or more issues caused the setup to fail.  Please fix the issues and then retry the setup. 

0x8007066 - Another version of this product is already installed.  Installation of this version cannot continue.  To configure or remove the existing version of this product, use Add/Remove Programs in the Control Panel.

Cause:

Milestone has confirmed that this issue is due to a corrupt installation of .NET 6.0.16 or 6.0.19. We have found this to occur occasionally when the user recently upgraded to XProtect 2023R2 or 2023R3. 

Fix:

The workaround is to reinstall .NET 6. 

Uninstall and reinstall .NET 6 (Note: reboot required)

• Stop all Milestone services on the management server.

• Open Add/Remove Programs or use the Control Panel
• Uninstall all .NET 6.0 packages, including any of the below:
  • • .NET 6.0 Windows Hosting
    • .NET 6.0 Runtime
    • ASP.NET Core 6.0
      
• Run the Boring Server Complete installer.
  • This will reinstall .NET 6 as well as the Boring Server.
• Reboot the Management Server
• Once the server restarts, the Milestone services will restart.
• Verify that Milestone starts as expected and that you can log in to the Milestone management client.
• Verify you can log in to Boring Toolbox.