If there is a way to unistall the qt 7.0.2 you should. This is rarely easy. I am very leary of any upgrades on machines that have capture cards inthem. In the future I would check with AJA tech before doing any such upgrades. The drivers obviously have to work hand in hand withQucikTime and things need to be tested before new driver are released.
Software update is a tempting and easy way to upgrade software, but I always check first because machines with cards in them are business machiinea and my business comes first. I know AJA has a beta driver testing right now and they test things very widely before releasing a driver.
Hopefully a new driver will be released and the new QT will be implemented.
If yo uahven’t backed up and can’t restore your system to a previous state then you try carbon copy cloner to do this, that way you can just restore you old system to exactly the way it was before the upgrade.
https://www.bombich.com/software/ccc.html
David