Unity 5 moved to ARC (Automatic Reference Counting). Starting from version 4.0.0, our Unity plugin supports ARC and doesn't require any additional steps
However, if you are using a version of our Unity plugin lower than 4.0.0, you will need to modify your Xcode project in order to properly build with our SDK. Simply go to "Build Phases" in your project settings and add the "-fno-objc-arc" flags to the following files under the Compile Sources section:
You can also add the flags directly from Unity, by right-clicking the files in the Unity inspector, and choosing "Compile flags".
Note: If you are using Unity 4, or using Unity 5 *without ARC enabled* and would like to use AppLovin Unity plugin 4.0.0 or above, you would need to configure the four classes listed above as ARC. In "Build Phases" add the "-fobjc-arc" flags to the above listed files under Compile Sources.
To find out if your Xcode project is ARC enabled, go to: Build Settings > Language Objective C > Objective-C Automatic Reference Counting and check if the value is Yes or No.