I have Norton 360 2013 installed on my PC, and it’s time to renew. Can I renew with a version 2013 (from within my installed Norton 360), or do I have to buy the version 2014?

Since year 2013, Norton 360 is considered version-less. This was company’s move towards its continuous protection idea (a product always up to date as long as the subscription is valid). Therefore, there’s no need to download and install the latest version. Simply keep your subscription active, and ensure you receive live updates regularly (LiveUpdate). This ensures your security program is in its latest version.