Please note: The classic apps are no longer being developed. A technically updated version of Catan with original rules and many expansions has been released under the name Catan Universe and is constantly being expanded. How to switch from the Classic app to Catan Universe is described here.
You can reach USM with questions and issues here:
If you have questions or want to know more about CATAN Universe, you can visit CatanUniverse.com. I can also reach them at support@catanuniverse.com or visit their community portal here.