"Starting April 2020, all iOS apps submitted to the App Store must be built with the iOS 13 SDK or later"

Question

I'm trying to upload an app to the appstore and I'm getting this error:

SDK Version Issue. This app was built with the iOS 12.1 SDK. Starting April 2020, all iOS apps submitted to the App Store must be built with the iOS 13 SDK or later, included in Xcode 11 or later.

I have this:

• Hardware: MacBook Pro (13-inch, Mid 2012)

• OS: macOS High Sierra 10.13.6 (17G10021) -- This is the max version I can get due to my hardware

• Xcode: 10.1 (10B61) -- This is the max version I can get due to my OS. 11 is incompatible

What are my possible solutions?

I could buy a new Macbook but I'd rather do this as my last choice (too expensive!!)

I also downloaded this: https://github.com/iGhibli/iOS-DeviceSupport/blob/master/DeviceSupport/13.0.zip and unzipped here: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform

It didn't work... it doesn't show as an option in Xcode Deployment Target:

Answer 1

I ended up installing Catalina directly from the appstore.

I thought it wasnt supported but it is, as shown below: