SwiftShader 4.0 is an older version of a software renderer for Direct3D/OpenGL. There is no official "full version" or "crack" — the project is open-source (under the Apache 2.0 license). Any site offering a "full version" or asking for payment is likely distributing outdated, modified, or potentially harmful files.
This means 99% of the websites offering the "Full Version" are third-party uploaders. You face two risks:
Use WinRAR or 7-Zip to extract the downloaded archive. You should see these three critical files: