hp-toolbox stopped running with qt5 error message

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:

(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**
(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