Microsoft .NET 3.5 offline installer Framework Service Pack 1 Runtime Files
The .NET Framework 3.5 Service Pack 1 (SP1) runtime setup includes files required to run applications developed using Microsoft Visual Studio. If your application gives you “runtime error” whiling executing the executable file developed using .NET Framework programming tools, then this application is required to be installed on system. Build incrementally upon .NET Framework 2.0, 3.0, 3.5, and includes .NET Framework 2.0 service pack 2 and .NET Framework 3.0 service pack 2 cumulative updates.