Today we have released a new version of the paid app on iOS which contains a bug and fails to start on some devices.
Unfortunately Apple gives us no way to get back to the older version so we have removed the app from the store temporarily and uploaded a bugfix version. Now we have to wait for Apple to validate and release it.
For those who have installed the update, we are very sorry but no workaround is available. Please use the lite version while you are waiting for the bugfix release.
Sorry for the inconvenience, this is definitely our fault.