iOS package should build with AIR SDK 188.8.131.52.
Please download Adobe AIR SDK 32 BETA (184.108.40.206) from the below url
New and updated features:
iOS SDK Upgrade:
AIR Runtime is now built with iOS 12.1 SDK, which enables AIR developers to use ANEs built with iOS 12.1 APIs without using the – platformSDK switch while packaging with ADT