Is it possible to update node-weblit based application without new installation?

I'm plan to release my web application under node-webkit platform and allow users to install it on their local machine. But before, I need to understand how will I update this application?

I see the following two approaches:

1. Download a new version of new application and replace older one
2. Autoupdate node-webkit application like Google Chrome does (so users don't need to do anything except rebooting application).

I'm very interested how should I do the second approach? Could you share your experience with maintaining of your node-webkit based applications?

Thanks!