If you specifically need the 2008 version to maintain legacy projects or older C++/C# applications, you can still find official resources:
A free, open-source, cross-platform code editor launched in 2015. It is lightweight and popular for web development.
Depending on whether you are looking for the modern, lightweight editor or the legacy professional IDE, here is everything you need to know about downloading and using these tools. 1. The Confusion: "Code" vs. "2008"
A heavyweight IDE designed specifically for Windows-based software development using .NET Framework 3.5. 2. How to Download Visual Studio 2008