Why Did I Need To Re-Install Norton Security Suite?

After rebooting my laptop I got a message that my version of Norton Security Suite was not compatible with Windows 10.  I have been running windows 10 on my HP laptop since it was officially released many months ago and after installation I installed the Windows 10 version of Norton.  I checked the version number and it was the latest version.  Anyway I clicked on the message and it downloaded the Norton Security Suite which when I clicked on it caused me to uninstall Norton and then I had to reinstall Norton (along with the updates).  It appears I am back where I started after wasting 30 minutes.  Why???