This is a "soft" installation. You do not install SwiftShader; you simply place the files in the game's folder.
Despite low performance, three demographics used SwiftShader 2.1: swift shader 2.1 hitman blood money
Swift Shader 2.1 is not a viable solution for playing Hitman: Blood Money acceptably. It lacks the performance and feature accuracy required. A proper GPU (even an old Intel GMA or GeForce 6 series) will run the game far better. For extremely low-end systems, consider older DirectX 8 titles or disabling post-processing via mods. This is a "soft" installation