iOS 12 and SDK

[Ludovic THEBAULT]

Hello,

My app (built with Livecode 8) also crash on IOS 12.
So, i built it with LC 9.01 and work on my device on iOS 12.

I submitted it, but Application Loader rejected it :
ERROR ITMS-90725: "SDK Version Issue. This app was built with the iOS '10.2' SDK. All iOS apps submitted to the App Store must be built with the iOS '11.0' SDK or later, included in Xcode [9.0] or later. Please update Xcode and rebuild your app. »

But i have only Xcode 8.2.1 and SDX 10, i am under MacOS X 10.11 and cannot upgrade.

Any solution other than bought a new mac ?

Thanks.

Ludovic