I have a single license one year for one computer. I’m unsure what you mean about going into settings… I have deleted all devices from my avast account but my license page still says there is one device linked to the license. I’m assuming this is why I cannot use it because it thinks it’s still linked to a different device. However I have had the same computer for years now, I have no idea how it decided I’d had two devices originally thus giving me access only to the trial version. I have used the avast clean uninstaller multiple times and still it won’t work. I don’t know how else to unlink my license from my device so that I can relink it and actually use it.