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!