@holger1405I don't actually know what the rep did. I told him my problems and the solutions I'd tried. He had me reinstall Origin, which of course didn't work. I told him I couldn't open the app or uninstall it and he told me to delete the files manually, which I didn't think would work but tried anyway since it worked for Coryachi. He put me on hold for ten minutes and then came back and said he was pushing the problem up the chain.
EDIT: A tool on the uninstall post worked! Thank you so much! And with a clean install, I was finally able to open DAI. Sweet, sweet game screen, I thought I'd never see you again 🙌