If you are running Windows Vista/7/8/10, nothing is required, because the .NET Framework is already installed on your Operating System by default.

But if you are running Windows 2000 or XP, you need to install the .NET Framework 4.0 from the Microsoft Website, following this link: https://www.microsoft.com/en-us/download/details.aspx?id=17851

Once the .NET Framework 4 is installed, just double-click on BlueBrick.exe file to run BlueBrick.