Downgraded from Windows 10 back to Windows 8. Norton disappeared. Can't unistall or reinstall.

So I downgraded from Windows 10 back to Windows 8. My norton security is gone. The icon for it in the task bar is unavailable, but if I search for it, an icon for it does appear. Clicking on it does nothing. I tried downloading it again, but a message said I had to uninstall the current version on my system. I did that, but it seems that it was already uninstalled. So now, I'm without security and can't download it again. What do I do?

Note: I'm using a Windows Surface with Windows 8.1