It seems the updater fails to update it self cause if you would have reached the second stage it would display which files it downloads etc.
Please try the following copy the file cfpupdat.exe from \Program Files\Comodo\Comodo Internet Security\Repair folder to \Program Files\Comodo\Comodo Internet Security\
And check for updates again see if that helps solve the issue, as this has been reported by other users as a workaround.
That fixed my problem too. Thank you.