To continue to use Scout, you'll need to upgrade to the latest version - this is still free, but you need to sign up for a (free) Creative Cloud account, and download it through the Creative Cloud application manager. There is no longer a standalone installer for Scout, however once you make this change, it'll be much easier to update in future.
You'll have noticed over the last few weeks that there was a notification in Scout telling you that there was an update available. We do expire older versions of Scout, because they contain bugs that are fixed in newer versions, and they may not work correctly with the latest version of Flash Player. New versions of Scout are always backwards-compatible, so you can still open any FLM files that you have saved.
You can download Adobe Scout CC, here: