If have been using AdWords Editor 10.6, it’s the time you should download and install the latest version i.e. 11.1.2. The support for the older version will end on 30th June 2015.
This new version is a standalone version, so there won’t be an auto upgrade. You would manually need to download and install. Yes, it would be a bit difficult for you to get yourself familiar with the new version as the interface is different, but once you get used to it, you will love this new version.