Fail to build correct Plugins for Unity

I had a similar issue to you and having the exact version of Unity they state fixed my issue. I was able to get it from here, you just have to scroll down a little.

https://unity3d.com/get-unity/download/archive

The build.py script seems to look only for that specific version so having anything else doesn't work.

Once I ran buil.py with the correct version of Unity, I was able to import the plugins into a newer version of Unity without any errors. Just a note, I don't believe the file size discrepancy you mentioned is an issue as before and after I had the correct version of Unity my core file was 151kb.

By the way, why don't apple just releases the correctly builded .tgz? it's really time-saving

Because Apple refuses to do anything that makes sense, and rather waste their users time. Their bullshit Git repo doesn't even work unless you have SPECIFIC versions of Xcode, NPM, Unity, etc., and they ONLY even mention the Unity version. What a joke. Apple continues to do nothing but piss me off

I think it can be built by modifying the Unity version in the source code file ProjectVersion.txt

For convenience, I build a copy and put it on Github https://github.com/liuyongjiesail/AppleUnityPlugins, which can be used directly.

Solved the crash problem of Apple's official website plugins when call GKLocalPlayer.Local.FetchItems()