#import <AppStoreUpdateKit/AppStoreUpdateKit.h>

//Create an app object with your app info. (the productID is important, find the productID on itunes website, eg: https://itunes.apple.com/us/app/kaka/id1434172933?mt=12)

    AppStoreUpdateAppObject *appObj = [[AppStoreUpdateAppObject alloc] initWithAppName:@"Kaka"
                                                                           withAppIcon:[NSImage imageNamed:@"cat"]
                                                                    withCurrentVersion:@"1.0.9"
                                                                         withProductID:@"1434172933"];
//Synchronize to check app update.
    //rslt will be YES if getting app info is successful.
    BOOL rslt =[[AppStoreUpdateManager sharedManager] checkAppUpdate:appObj];
    //Check if new version is available.
    rslt = [appObj isNewVersionAvailable]
    
//Asynchronize to check app update.
    [[AppStoreUpdateManager sharedManager] checkAppUpdateAsync:appObj withCompletionBlock:^(BOOL rslt, AppStoreUpdateAppObject * _Nonnull AppObj) {
        //rslt will be YES if getting app info is successful.
        
        //Check if new version is available.
        rslt = [AppObj isNewVersionAvailable]
        
        //Your code here
    }];

    //Create a AppStoreUpdateUIConfigure object and set configure's value.
AppStoreUpdateUIConfigure *UIConfigure = [[AppStoreUpdateUIConfigure alloc] init];
    [UIConfigure setSkipButtonTitle:@"Skip"];
    [UIConfigure setUpdateButtonTitle:@"Update"];
    [UIConfigure setLaterButtonTitle:@"Later"];
    [UIConfigure setVersionText:@"Version %@"];
    [UIConfigure setReleaseNotesText:@"Release Notes:\n\n"];
    [UIConfigure setReleaseNotesNoneText:@"Release Notes:\n\n None."];
    
    //set configure object to AppStoreUpdateManager
    [[AppStoreUpdateManager sharedManager] customize:UIConfigure];

...

//Check if the current new version has been skipped 
    [[AppStoreUpdateManager sharedManager] isCurrentNewVersionSkipped:appObj]
    
//Skip the current new version
    [[AppStoreUpdateManager sharedManager] skipCurrentNewVersion:AppObj];
      

...
//This method MUST be invoked in the main thread!!
    [[AppStoreUpdateManager sharedManager] requestAppUpdateWindow:appObj withCompletionCallback:^(AppUpdateWindowResult rslt, AppStoreUpdateAppObject * _Nonnull AppObj) {
                    switch (rslt) {
                        case AppUpdateWindowResultUpdate:
                            [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"macappstore://itunes.apple.com/app/id%@",[AppObj productID]]]];
                            break;
                            
                        case AppUpdateWindowResultSkip:
                            [[AppStoreUpdateManager sharedManager] skipCurrentNewVersion:AppObj];
                            break;
                            
                        case AppUpdateWindowResultLater:
                            break;
                            
                        default:
                            break;
                    }
                }];