I deleted 3.6.20, so I could do a clean install of 3.6.22. After downloading and installing, I get a message
cx_freeze: Python error in main script (traceback unavailable)
Error in sys.excepthook
Exception: cannot import name ‘Application’
Original Exception: No module named ‘sip’
After repeating three times, I gave up. I don’t see any way to download 3.6.20.