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Install OpenCV in Windows 10

I installed Qt 5, CMake 3, Visual Studio 2015 and OpenCV 3. I made a test program using Qt Creator that tries to open an image, but nothing happens. I see no error messages in Qt Creator. How do I know I have installed OpenCV correctly and what I am missing? The reason I tried OpenCV 3 instead of OpenCV 4 is that I found an e-book (Amin Ahmadi Tazehkandi, 2018) in my school's library and wanted to see if it helps me learn OpenCV more easily. I can try to install OpenCV 4 instead, if it makes installing OpenCV more easy.