I work on the Tools for Apache Cordova in Visual Studio at Microsoft.
A mistake was made publishing this update. At the moment it will re-install update 3 rather than install update 4.
I'm terribly sorry for the inconvenience this has caused you. We are aware of the problem and are working to resolve it. I will update this answer when it's been fixed.
** Update 11/2/2015 9:44AM ** We have temporarily pulled the update notification to prevent further confusion. We will republish the notification once we've fixed the issue and verified that everything is working as expected. That should happen in a day or two. Thanks for your patience and understanding.
** Update 11/3/2015 4:45PM ** We just released update 4. You should see the notification in visual studio and the installer should work properly this time. Please let me know if you have any problems and thanks again for your patience!