Here is a collection of links to the standalone Microsoft Dot Net (.NET) installers.

.NET Framework 4.0 Setup

• Download 32 bit and 64 bit versions

.NET Framework 3.5 Setup

• Download 32 bit and 64 bit versions

.NET Framework 3.5 Setup Service Pack 1

• Download .NET 3.5 Service Pack 1

.NET Framework 3.0 Setup

• Download 32 bit version
• Download 64 bit version

.NET Framework 2.0 Setup

• Download 32 bit version
• Download 64 bit version

.NET Framework 1.1 Setup

• Download .NET 1.1

More Information

Source: http://www.lazydesis.com/software/215640-all-dot-net-framework-offline-standalone-installers-direct-links.html