/opt folder and installing from flatpak

I was trying to install a program called soundux from pacstall, and it created a desktop icon but wouldn't install after a dependency issue. Clicking on that icon just created another icon on my task bar, but then it would just disappear without doing anything. I also couldn't uninstall the application and get rid of the desktop icon because it had never installed in the first place. After giving up on getting that working, I tried installing from flatpak. While it did not suffer from dependency issues, the application still wouldn't open because it was using the same pacstall application (I think). To try and fix this, I deleted the /opt folder the desktop application was in, and while this did get rid of it, installing from flatpak doesn't seem to recreate the folder, and I can't open the application without it. How do I fix this? I'm on Kubuntu 24.04