I installed WinPython64-3.9.2.0 on my Windows 10 laptop.
I tried to make a GUI with Qt Designer, but when I click on Form and then on View Python Code... I get the following warning message:

Unable to launch
C:WPy64-3910\python-3.9.1.amd64\lib\site-packages\pyqt_tools\Qt\bin\bin\uic:
Process failed to start: The system cannot find the file specified.

I click on OK and I don't get the Python code of the GUI.
Please, can you help me?
The solution is to open the Start menu and click Settings, type "Edit environment variables for your account" and click on it. You will get a new window called "Environmental Variables". Click "New" under "User variables for username" and you will get another window.
Next to "variable name:" write "Path" and next to "Variable value:" write

C:\WPy64-3910\python-3.9.1.amd64 ; C:\WPy64-3910\python-3.9.1.amd64\Scripts

Note that I used a semicolumn to separate the two paths.
In case you use LaTex editors like Texmaker remember to add also this after a semicolumn:

C:\Users\ username \AppData\Local\Programs\MiKTeX\miktex\bin\x64\

Otherwise Texmaker won't work.
When I try to view the Python code from Qt Designer, in WinPython, I get an error