This error seems to have reappeared since the last time it was fixed. For me it is currently not letting me set a price for AUD.
mattdelves
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Sorry, my question may not have been entirely clear. I've got an @availability check around the new stuff. What I needed to do was create a main.swift file that does the switching between the new type which conforms to App and the older AppDelegate implementation. This ended up looking like the following.
if #available(macOS 10.16, *) {
MyAwesomeNewImplementaitonOfApp.main()
} else {
let app = NSApplication.shared
let delegate = AppDelegate()
app.delegate = delegate
app.run()
}