Microsoft is always providing updates to the .NET Framework, therefore some Microsoft-made IDE (Integrated Development Environment) will always use the newer .NET Framework versions later on, whereas some applications may still be using older versions of the .NET Framework. Many programming languages such as C#, VB.NET, C++ are running into its application with the .NET Framework, so it’s no wonder many applications on the internet need the .NET Framework to run it. .NET Framework 4.5 is popular because it has been used by default in Windows 8, and on Windows 10 most recent Microsoft is bringing the newer .NET Framework, but when applications using the .NET Framework 4.5 will continue to be usable in Windows 10. For those of you who need .NET Framework 4.5 Offline Installer, you can download it via the following link. .NET Framework 4.5 is support for 32 bit and 64 bit operating systems.