Download OpenCV

1, the official website:

　https://opencv.org/

　https://opencv.org/releases/

　https://github.com/opencv/opencv/tree/4.2.0

2, Win a precompiled version of the official version seems only version of x64, x86 need to compile

　I do not remember which version is from the beginning is like this ... but I see looks like I own the compiled version is OpenCV2 and OpenCV3 have to compile the x86 and x64. Anyway, now OpenCV4 certainly start pre-compiled version of the x64 only ...

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