pip install opencv-python==4.5.3.56 --user -i https://pypi.tuna.tsinghua.edu.cn/simple
You can copy the above command and download it directly in CMD or Anaconda Prompt
The python version I use is version 3.7
After everyone downloads it, follow the steps to download cv2 and use it.
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3. Click the + in the upper right corner
4. Search for the cv2 you want to install in the search bar