PyQt5: How to install/run Qt Designer

If you are working in python virtual environment, in the command window

>>qt5-tools designer

can open designer window.

I struggled with this as well. The pyqt5-tools approach is cumbersome so I created a standalone installer for Qt Designer. It's only 40 MB. Maybe you will find it useful!

The Qt designer is not installed with the pip installation.

You can either download the full download from sourceforge (probably won't be the last pyqt release, and might be buggy on presence of another installation, like yours) or install it with another (unofficial) pypi package - pyqt5-tools (pip install pyqt5-tools), then run the designer from the following subpath of your python directory -

...\Python36\Lib\site-packages\pyqt5-tools\designer\designer.exe