http://hitechworld.org/cprojects/data/DirectX3.zip DirectX 3 SDK – 78 MB
http://hitechworld.org/cprojects/data/DirectX2.zip DirectX 2 SDK – 32MB
http://hitechworld.org/cprojects/data/DirectX1_GDC2005_Beta.zip DirectX 1 SDK – 6MB
These are old SDKs from the 1990s. Most samples from the DX3 SDK still can startup on modern Windows, some work partially, while others don’t work properly. Samples from the DX1 SDK almost completely can not even start up on modern Windows.