because I was having similar issues to those noted in #578, I upgraded packages as per the advice in that issue : mark@z800:~$ pip3 install --upgrade PyQt5 ...

2.Install "pip" -go to https://bootstrap.pypa.io-press on "get-pip.py" and save the web page as "get-pip.py" open "get-pip.py" and run it open cmd as administartor and run the command "python.exe -m ...