After create the app instance. A sample demo code: int main(int argc, const char * argv[]) { @autoreleasepool { NSApplication *app = [NSApplication sharedApplication]; BOOL returnValue = [NSApp setActivationPolicy: NSApplicationActivationPolicyAccessory]; } return NSApplicationMain(argc, argv); }

I found that this is caused by the helper running in a sandbox. If the helper is in a non-sandbox environment, the downloaded dmg and installed app can be opened correctly. Is this expected? Are there any solutions?