If you’re using a version of iOS older than iOS 11, you can keep using Communicado 1.6. It can also be restored through the App Store, provided you have bought the older version in the past. This is done by selecting Communicado from your Purchases in the App Store app, and then download it again.
More information about using Communicado 1.6 can be found here.
For editors it will be good to know that user content can be exported from Communicado 2.0 to Communicado 1.6, and vice versa.