QT designer installed After success, install PIP anyway install PyQt5 And pip Install pyqt5 designer is useless
So consider whether the installation path of QT designer is wrong. Therefore, searching designer.exe in the folder unexpectedly found 2 files. 
The first path has been used before, but the UI file cannot be converted to py file. The link below was replaced.
OK after running the test
Hope to help you!
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