diff --git a/bigsurblocker/main.m b/bigsurblocker/main.m
index 8416c3f..4fa700a 100644
--- a/bigsurblocker/main.m
+++ b/bigsurblocker/main.m
@@ -16,82 +16,86 @@ @implementation AppDelegate
 
 - (void)applicationDidFinishLaunching:(NSNotification *)notification {
     self.alertTriggered = NO;
-    
+
     NSWorkspace *workspace = [NSWorkspace sharedWorkspace];
     NSNotificationCenter *nc = [workspace notificationCenter];
-    
+
     NSOperationQueue *notificationQueue = [NSOperationQueue new];
-    
+
     // Subscribe for notifications when apps are launched
     [nc addObserverForName:NSWorkspaceDidLaunchApplicationNotification
                     object:nil
                      queue:notificationQueue
                 usingBlock:^(NSNotification * _Nonnull note) {
-        
+
         // Get information about the launched app
         NSDictionary *userInfo = [note userInfo];
         NSRunningApplication *runningApp = [userInfo objectForKey:NSWorkspaceApplicationKey];
         NSString *bundleID = runningApp.bundleIdentifier;
-        
-        NSArray *bundleIDsToBlock = @[
+
+        // Load our user defaults suite. This will allow the alert text
+        // to be specified with a configuration profile
+        NSUserDefaults *userDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"com.hjuutilainen.bigsurblocker"];
+
+        NSArray *bundleIDsToBlock = [userDefaults arrayForKey:@"bundleIDsToBlock"];
+
+        if (!bundleIDsToBlock) {
+        bundleIDsToBlock = @[
             @"com.apple.InstallAssistant.BigSur",
             @"com.apple.InstallAssistant.Seed.macOS1016Seed1",
         ];
-        
+        }
         if ([bundleIDsToBlock containsObject:bundleID]) {
             NSLog(@"Detected macOS installer app launch");
-            
+
             // Get the localized app name
             NSString *appName = runningApp.localizedName;
-            
+
             // Terminate the app
             NSLog(@"Terminating \"%@\", \"%@\"", appName, bundleID);
-            
+
             // We could be polite but...
             [runningApp forceTerminate];
-            
+
             // Check if we are already displaying an alert
             if (self.alertTriggered) {
                 NSLog(@"Skipping alert. Previous alert still running");
             } else {
                 self.alertTriggered = YES;
-                
+
                 // GUI must be run from main thread
                 dispatch_async(dispatch_get_main_queue(), ^{
-                    
-                    // Load our user defaults suite. This will allow the alert text
-                    // to be specified with a configuration profile
-                    NSUserDefaults *userDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"com.hjuutilainen.bigsurblocker"];
-                    
+
+
                     NSString *messageText = [userDefaults stringForKey:@"AlertTitle"];
                     if (!messageText) {
                         messageText = NSLocalizedString(@"The application \"%@\" has been blocked", @"");
                     }
-                    
+
                     NSString *informativeText = [userDefaults stringForKey:@"AlertText"];
                     if (!informativeText) {
                         informativeText = NSLocalizedString(@"Contact your administrator for more information", @"");
                     }
-                    
+
                     // Configure the alert
                     NSAlert *alert = [[NSAlert alloc] init];
-                    
+
                     [alert setMessageText:[NSString stringWithFormat:messageText, appName]];
                     [alert setInformativeText:informativeText];
-                    
+
                     [alert addButtonWithTitle:NSLocalizedString(@"OK", @"")];
                     [alert setAlertStyle:NSAlertStyleWarning];
                     [alert setIcon:[NSImage imageNamed:NSImageNameCaution]];
-                    
+
                     // Show the alert above all other apps and windows
                     [[NSApplication sharedApplication] activateIgnoringOtherApps:YES];
                     [[alert window] setLevel:NSStatusWindowLevel];
-                    
+
                     // Show the alert
                     //
                     // Note that the [alert runModal] will not return until the user dismisses the popup window
                     [alert runModal];
-                    
+
                     // User dismissed the alert, change status to allow new ones to be displayed
                     self.alertTriggered = NO;
                 });