Installing PyQt5 Designer

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What's important is what version your python installation is(32-bit or 64-bit).
You see it when you type python<enter> in cmd.

For 32-bit:
PyQt5-5.7.1-5.7.1-cp34.cp35.cp36.cp37-none-win32.whl (md5)

For 64-bit:
PyQt5-5.7.1-5.7.1-cp34.cp35.cp36-none-win_amd64.whl (md5)