The hp (hewlett packard printer) toolbox gui to manage printer functions has stopped working. Last used a few days ago. I have no idea what recent install or change made it stop working. There were no recent updates to hplip that contains hp-toolbox.

When run from terminal hp-toolbox throws error message below:

Code:
(base) tom@mydesktop:~> hp-toolbox

HP Linux Imaging and Printing System (ver. 3.20.11)
HP Device Manager ver. 15.0

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

error: /usr/lib64/libQt5Core.so.5: version `Qt_5.15' not found (required by /home/tom/.local/lib
/python3.6/site-packages/PyQt5/QtWidgets.abi3.so)
(base) tom@mydesktop:~>
The file /usr/lib64/libQt5Core.so.5 is a simlink to libQt5Core.so.5.12.7 which is the installed version. and not 5.15. I do like this app and would like to regain use of it.

My choices to me seem to be:

upgrade qt5core 5.12 to 5.15 ----- probabably not practical
downgrade hplp -- can't find an alternate available version.
create another simlink to 5.15 that really uses 5.12 Doing this might upset a future upgrade to 5.15 from 5.12

Does anyone have an idea of a solution to this that they could suggest?

thanks, tom kosvic