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It should work (Wing uses Qt5 via PyQt5 so we use this all the time here).

The most common cause of this is Wing picking up a different Python installation from the one that has PyQt5 installed. You can check this by comparing the value of sys.executable (after 'import sys') in the Python that you want to use with the value reported by the Source > Show Python Environment menu item. If not correct, set the Python Executable in Wing's Project Properties.

If that does not help, please submit a bug report from Wing's Help menu after replicating the problem, and include the ide.log where prompted. This will show us if there are logged unexpected errors.