TL:DR: LogMeIn decided to screw up the customers who once paid $99 to get their premium Ignition iOS app and wants them to pay monthly/yearly.
"While your existing Ignition app will continue to work as it always has, it will no longer receive updates and bug fixes. However, you may switch to the new LogMeIn for iOS/Android app at any time. It's free to download and will work with a Pro account."