这个问题的原因有可能是由于下载地址不正确或者缺少必要的证书等原因导致的连接错误。解决此问题的方法是，首先检查下载地址是否正确，然后确认应用商店是否被正确配置和设置。另外，AppCenter的Maniifest文件也需要正确地设置，以便正确地安装应用程序。

以下是示例代码：

1.检查下载地址是否正确：

NSURL* url = [NSURL URLWithString:@"https://url-to-download-app-from-app-center"]; NSURLSession* session = [NSURLSession sharedSession];

NSURLSessionDownloadTask* downloadTask = [session downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) { if (!error) { NSString* fileName = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleName"]; NSString* cachesDirectory = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0]; NSString* destinationFilePath = [NSString stringWithFormat:@"%@/%@", cachesDirectory, fileName];

    NSFileManager* fileManager = [NSFileManager defaultManager];
    [fileManager moveItemAtPath:[location path] toPath:destinationFilePath error:nil];

    // Install the downloaded app
    NSURL* destinationURL = [NSURL fileURLWithPath:destinationFilePath];
    [[UIApplication sharedApplication] openURL:destinationURL options:@{} completionHandler:nil];
} else {
    NSLog(@"Error downloading app: %@", error.localizedDescription);
}

}]; [downloadTask resume];

2.检查是否正确配置和设置AppCenter 应用商店

• (void)viewDidLoad { [super viewDidLoad];

  [[MSACAppCenter sharedInstance] setLogLevel:MSACLogLevelVerbose];

  /* Configure the SDK */ [MSACAppCenter start:@"{Your App Secret}" withServices:@[ [MSACAnalytics class], [MSACCrashes class], [MSACDistribute class] ]]; [MSACDistribute setDelegate:self]; [MSACDistribute updateTrack:@"{Your Release Track}"]; }

3.正确设置Manifest文件：