It has been moved to a separated package.
Based on this answer and my own experience,
Just execute in a terminal:
pip install PyQtWebEngine
If you still got problems with PyQt, try uninstalling all of the PyQt related libraries:
pip uninstall PyQt5
pip uninstall PyQt5-sip
pip uninstall PyQtWebEngine
Then install them again, which should fix the following errors:
ModuleNotFoundError: No module named 'PyQt5.sip'
ModuleNotFoundError: No module named 'PyQt5.QtWebEngineWidgets'
If you got problems uninstalling the libraries, go to your Python folder, like C:Users<USERNAME>AppDataLocalProgramsPythonPython<PYTHON-VERSION>Libsite-packages
and manually delete the PyQt folders, then uninstall everything and install again. (Make sure you have the latest Python version and upgraded your pip too.)
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