You need to reinstall Creative Cloud, not just Photoshop. The CCX run through Creative cloud and that is the program that is messed up. You can contact Adobe support to see if there is another fix. tell them that CCX files won’t install. Although the Indian tech support chat is really good about blaming 3rd party as soon as you mention it just to be able to close their ticket. That is why is is probably easiest to just uninstall and reinstall Creative Cloud. I’m pretty sure that will fix the issue.