I just installed Qt 5.4.1 on Windows 7. And there is no QtDesigner. Also there is no QtDesigner in MaintenanceTool. How can I install it?
install designer using apt package manager
sudo apt-get install python-qt4 qt4-designer
run the command designer and it will work for you
designer
if it doesn't try /usr/bin/designer
/usr/bin/designer
it worked for me i am using python 3.6 with pyqt-5.16