The installation of Studio 14 will prompt for the installation of .NET Framework 3.5 if it is not already installed on the system. In some cases it is normal that it may take 30-45 minutes to install depending on what is already installed on the system. It may appear that the installation has hung up, do not cancel it and let it finish. The .NET Framework 3.5 uses a Microsoft installer that we cannot accelerate. We apologize for any inconvenience.