diff --git a/Tranga/Connector.cs b/Tranga/Connector.cs
index 3331517..2f91f79 100644
--- a/Tranga/Connector.cs
+++ b/Tranga/Connector.cs
@@ -127,7 +127,8 @@ public abstract class Connector
     /// <param name="publication">Publication that contains Chapter</param>
     /// <param name="chapter">Chapter with Images to retrieve</param>
     /// <param name="parentTask">Will be used for progress-tracking</param>
-    public abstract void DownloadChapter(Publication publication, Chapter chapter, DownloadChapterTask parentTask);
+    /// <param name="cancellationToken"></param>
+    public abstract void DownloadChapter(Publication publication, Chapter chapter, DownloadChapterTask parentTask, CancellationToken? cancellationToken = null);
 
     /// <summary>
     /// Copies the already downloaded cover from cache to downloadLocation
@@ -227,8 +228,10 @@ public abstract class Connector
     /// <param name="comicInfoPath">Path of the generate Chapter ComicInfo.xml, if it was generated</param>
     /// <param name="requestType">RequestType for RateLimits</param>
     /// <param name="referrer">Used in http request header</param>
-    protected void DownloadChapterImages(string[] imageUrls, string saveArchiveFilePath, byte requestType, DownloadChapterTask parentTask, string? comicInfoPath = null, string? referrer = null)
+    protected void DownloadChapterImages(string[] imageUrls, string saveArchiveFilePath, byte requestType, DownloadChapterTask parentTask, string? comicInfoPath = null, string? referrer = null, CancellationToken? cancellationToken = null)
     {
+        if (cancellationToken?.IsCancellationRequested??false)
+            return;
         logger?.WriteLine("Connector", $"Downloading Images for {saveArchiveFilePath}");
         //Check if Publication Directory already exists
         string directoryPath = Path.GetDirectoryName(saveArchiveFilePath)!;
@@ -250,6 +253,8 @@ public abstract class Connector
             logger?.WriteLine("Connector", $"Downloading Image {chapter + 1:000}/{imageUrls.Length:000} {parentTask.publication.sortName} {parentTask.publication.internalId} Vol.{parentTask.chapter.volumeNumber} Ch.{parentTask.chapter.chapterNumber} {parentTask.progress:P2}");
             DownloadImage(imageUrl, Path.Join(tempFolder, $"{chapter++}.{extension}"), requestType, referrer);
             parentTask.IncrementProgress(1f / imageUrls.Length);
+            if (cancellationToken?.IsCancellationRequested??false)
+                return;
         }
         
         if(comicInfoPath is not null)
diff --git a/Tranga/Connectors/MangaDex.cs b/Tranga/Connectors/MangaDex.cs
index 6f192ee..faa72e4 100644
--- a/Tranga/Connectors/MangaDex.cs
+++ b/Tranga/Connectors/MangaDex.cs
@@ -207,8 +207,10 @@ public class MangaDex : Connector
         return chapters.OrderBy(chapter => Convert.ToSingle(chapter.chapterNumber, chapterNumberFormatInfo)).ToArray();
     }
 
-    public override void DownloadChapter(Publication publication, Chapter chapter, DownloadChapterTask parentTask)
+    public override void DownloadChapter(Publication publication, Chapter chapter, DownloadChapterTask parentTask, CancellationToken? cancellationToken = null)
     {
+        if (cancellationToken?.IsCancellationRequested??false)
+            return;
         logger?.WriteLine(this.GetType().ToString(), $"Downloading Chapter-Info {publication.sortName} {publication.internalId} {chapter.volumeNumber}-{chapter.chapterNumber}");
         //Request URLs for Chapter-Images
         DownloadClient.RequestResult requestResult =
@@ -231,7 +233,7 @@ public class MangaDex : Connector
         File.WriteAllText(comicInfoPath, GetComicInfoXmlString(publication, chapter, logger));
         
         //Download Chapter-Images
-        DownloadChapterImages(imageUrls.ToArray(), GetArchiveFilePath(publication, chapter), (byte)RequestType.AtHomeServer, parentTask, comicInfoPath);
+        DownloadChapterImages(imageUrls.ToArray(), GetArchiveFilePath(publication, chapter), (byte)RequestType.AtHomeServer, parentTask, comicInfoPath, cancellationToken:cancellationToken);
     }
 
     private string? GetCoverUrl(string publicationId, string? posterId)
diff --git a/Tranga/Connectors/Manganato.cs b/Tranga/Connectors/Manganato.cs
index 4e5b2d1..5085320 100644
--- a/Tranga/Connectors/Manganato.cs
+++ b/Tranga/Connectors/Manganato.cs
@@ -169,8 +169,10 @@ public class Manganato : Connector
         return ret;
     }
 
-    public override void DownloadChapter(Publication publication, Chapter chapter, DownloadChapterTask parentTask)
+    public override void DownloadChapter(Publication publication, Chapter chapter, DownloadChapterTask parentTask, CancellationToken? cancellationToken = null)
     {
+        if (cancellationToken?.IsCancellationRequested??false)
+            return;
         logger?.WriteLine(this.GetType().ToString(), $"Downloading Chapter-Info {publication.sortName} {publication.internalId} {chapter.volumeNumber}-{chapter.chapterNumber}");
         string requestUrl = chapter.url;
         DownloadClient.RequestResult requestResult =
@@ -183,7 +185,7 @@ public class Manganato : Connector
         string comicInfoPath = Path.GetTempFileName();
         File.WriteAllText(comicInfoPath, GetComicInfoXmlString(publication, chapter, logger));
         
-        DownloadChapterImages(imageUrls, GetArchiveFilePath(publication, chapter), (byte)1, parentTask, comicInfoPath, "https://chapmanganato.com/");
+        DownloadChapterImages(imageUrls, GetArchiveFilePath(publication, chapter), (byte)1, parentTask, comicInfoPath, "https://chapmanganato.com/", cancellationToken);
     }
 
     private string[] ParseImageUrlsFromHtml(Stream html)
diff --git a/Tranga/Connectors/Mangasee.cs b/Tranga/Connectors/Mangasee.cs
index 33c4256..76214c2 100644
--- a/Tranga/Connectors/Mangasee.cs
+++ b/Tranga/Connectors/Mangasee.cs
@@ -209,16 +209,20 @@ public class Mangasee : Connector
         return ret.OrderBy(chapter => Convert.ToSingle(chapter.chapterNumber, chapterNumberFormatInfo)).ToArray();
     }
 
-    public override void DownloadChapter(Publication publication, Chapter chapter, DownloadChapterTask parentTask)
+    public override void DownloadChapter(Publication publication, Chapter chapter, DownloadChapterTask parentTask, CancellationToken? cancellationToken = null)
     {
-        while (this._browser is null)
+        if (cancellationToken?.IsCancellationRequested??false)
+            return;
+        while (this._browser is null && !(cancellationToken?.IsCancellationRequested??false))
         {
             logger?.WriteLine(this.GetType().ToString(), "Waiting for headless browser to download...");
             Thread.Sleep(1000);
         }
+        if (cancellationToken?.IsCancellationRequested??false)
+            return;
         
         logger?.WriteLine(this.GetType().ToString(), $"Downloading Chapter-Info {publication.sortName} {publication.internalId} {chapter.volumeNumber}-{chapter.chapterNumber}");
-        IPage page = _browser.NewPageAsync().Result;
+        IPage page = _browser!.NewPageAsync().Result;
         IResponse response = page.GoToAsync(chapter.url).Result;
         if (response.Ok)
         {
@@ -234,7 +238,7 @@ public class Mangasee : Connector
             string comicInfoPath = Path.GetTempFileName();
             File.WriteAllText(comicInfoPath, GetComicInfoXmlString(publication, chapter, logger));
         
-            DownloadChapterImages(urls.ToArray(), GetArchiveFilePath(publication, chapter), (byte)1, parentTask, comicInfoPath);
+            DownloadChapterImages(urls.ToArray(), GetArchiveFilePath(publication, chapter), (byte)1, parentTask, comicInfoPath, cancellationToken:cancellationToken);
         }
     }
 }
\ No newline at end of file
diff --git a/Tranga/TaskManager.cs b/Tranga/TaskManager.cs
index 1f5edd5..2de3788 100644
--- a/Tranga/TaskManager.cs
+++ b/Tranga/TaskManager.cs
@@ -129,16 +129,18 @@ public class TaskManager
                 {
                     logger?.WriteLine(this.GetType().ToString(), $"Disposing failed task {removeTask.Key}.");
                     removeTask.Key.parentTask?.DecrementProgress(removeTask.Key.progress);
-                    //removeTask.Value.Dispose(); Currently not available, however since task is removed from _allTasks should work. Memory leak however...
+                    removeTask.Value.Dispose();
                     toRemove.Add(removeTask.Key);
                 }
             }
             foreach (DownloadChapterTask taskToRemove in toRemove)
             {
                 DeleteTask(taskToRemove);
-                AddTask(new DownloadChapterTask(taskToRemove.task, taskToRemove.connectorName,
+                DownloadChapterTask newTask = new DownloadChapterTask(taskToRemove.task, taskToRemove.connectorName,
                     taskToRemove.publication, taskToRemove.chapter, taskToRemove.language,
-                    taskToRemove.parentTask));
+                    taskToRemove.parentTask);
+                AddTask(newTask);
+                taskToRemove.parentTask?.ReplaceFailedChildTask(taskToRemove, newTask);
             }
             
             if(allTasksWaitingLength != _allTasks.Count(task => task.state is TrangaTask.ExecutionState.Waiting))
@@ -155,10 +157,11 @@ public class TaskManager
     public void ExecuteTaskNow(TrangaTask task)
     {
         task.state = TrangaTask.ExecutionState.Running;
+        CancellationToken cToken = new CancellationToken();
         Task t = new(() =>
         {
-            task.Execute(this, this.logger);
-        });
+            task.Execute(this, this.logger, cToken);
+        }, cToken);
         if(task.GetType() == typeof(DownloadChapterTask))
             _runningDownloadChapterTasks.Add((DownloadChapterTask)task, t);
         t.Start();
diff --git a/Tranga/TrangaTask.cs b/Tranga/TrangaTask.cs
index 274a461..73d70fd 100644
--- a/Tranga/TrangaTask.cs
+++ b/Tranga/TrangaTask.cs
@@ -71,20 +71,22 @@ public abstract class TrangaTask
     /// </summary>
     /// <param name="taskManager"></param>
     /// <param name="logger"></param>
-    protected abstract void ExecuteTask(TaskManager taskManager, Logger? logger);
+    /// <param name="cancellationToken"></param>
+    protected abstract void ExecuteTask(TaskManager taskManager, Logger? logger, CancellationToken? cancellationToken = null);
 
     /// <summary>
     /// Execute the task
     /// </summary>
     /// <param name="taskManager">Should be the parent taskManager</param>
     /// <param name="logger"></param>
-    public void Execute(TaskManager taskManager, Logger? logger)
+    /// <param name="cancellationToken"></param>
+    public void Execute(TaskManager taskManager, Logger? logger, CancellationToken? cancellationToken = null)
     {
         logger?.WriteLine(this.GetType().ToString(), $"Executing Task {this}");
         this.state = ExecutionState.Running;
         this.executionStarted = DateTime.Now;
         this.lastChange = DateTime.Now;
-        ExecuteTask(taskManager, logger);
+        ExecuteTask(taskManager, logger, cancellationToken);
         this.lastExecuted = DateTime.Now;
         this.state = ExecutionState.Waiting;
         logger?.WriteLine(this.GetType().ToString(), $"Finished Executing Task {this}");
diff --git a/Tranga/TrangaTasks/DownloadChapterTask.cs b/Tranga/TrangaTasks/DownloadChapterTask.cs
index f424ed4..0638a34 100644
--- a/Tranga/TrangaTasks/DownloadChapterTask.cs
+++ b/Tranga/TrangaTasks/DownloadChapterTask.cs
@@ -20,10 +20,12 @@ public class DownloadChapterTask : TrangaTask
         this.parentTask = parentTask;
     }
 
-    protected override void ExecuteTask(TaskManager taskManager, Logger? logger)
+    protected override void ExecuteTask(TaskManager taskManager, Logger? logger, CancellationToken? cancellationToken = null)
     {
+        if (cancellationToken?.IsCancellationRequested??false)
+            return;
         Connector connector = taskManager.GetConnector(this.connectorName);
-        connector.DownloadChapter(this.publication, this.chapter, this);
+        connector.DownloadChapter(this.publication, this.chapter, this, cancellationToken);
         taskManager.DeleteTask(this);
     }
     
diff --git a/Tranga/TrangaTasks/DownloadNewChaptersTask.cs b/Tranga/TrangaTasks/DownloadNewChaptersTask.cs
index 1d1caa0..448a65b 100644
--- a/Tranga/TrangaTasks/DownloadNewChaptersTask.cs
+++ b/Tranga/TrangaTasks/DownloadNewChaptersTask.cs
@@ -8,46 +8,59 @@ public class DownloadNewChaptersTask : TrangaTask
     public string connectorName { get; }
     public Publication publication { get; }
     public string language { get; }
-    [JsonIgnore]private int childTaskAmount { get; set; }
+    [JsonIgnore]private HashSet<DownloadChapterTask> childTasks { get; }
     
     public DownloadNewChaptersTask(Task task, string connectorName, Publication publication, TimeSpan reoccurrence, string language = "en") : base(task, reoccurrence)
     {
         this.connectorName = connectorName;
         this.publication = publication;
         this.language = language;
-        childTaskAmount = 0;
+        this.childTasks = new();
     }
     
     public new float IncrementProgress(float amount)
     {
-        this.progress += amount / this.childTaskAmount;
+        this.progress += amount / this.childTasks.Count;
         this.lastChange = DateTime.Now;
         return this.progress;
     }
     
     public new float DecrementProgress(float amount)
     {
-        this.progress -= amount / this.childTaskAmount;
+        this.progress -= amount / this.childTasks.Count;
         this.lastChange = DateTime.Now;
         return this.progress;
     }
 
-    protected override void ExecuteTask(TaskManager taskManager, Logger? logger)
+    protected override void ExecuteTask(TaskManager taskManager, Logger? logger, CancellationToken? cancellationToken = null)
     {
+        if (cancellationToken?.IsCancellationRequested??false)
+            return;
         Publication pub = publication!;
         Connector connector = taskManager.GetConnector(this.connectorName);
         
         //Check if Publication already has a Folder
         pub.CreatePublicationFolder(taskManager.settings.downloadLocation);
         List<Chapter> newChapters = GetNewChaptersList(connector, pub, language!, ref taskManager.chapterCollection);
-        this.childTaskAmount = newChapters.Count;
 
         connector.CopyCoverFromCacheToDownloadLocation(pub, taskManager.settings);
         
         pub.SaveSeriesInfoJson(connector.downloadLocation);
 
         foreach (Chapter newChapter in newChapters)
-            taskManager.AddTask(new DownloadChapterTask(Task.DownloadChapter, this.connectorName!, pub, newChapter, this.language, this));
+        {
+            DownloadChapterTask newTask = new (Task.DownloadChapter, this.connectorName!, pub, newChapter, this.language, this);
+            taskManager.AddTask(newTask);
+            this.childTasks.Add(newTask);
+        }
+    }
+
+    public void ReplaceFailedChildTask(DownloadChapterTask failed, DownloadChapterTask newTask)
+    {
+        if (!this.childTasks.Contains(failed))
+            throw new ArgumentException($"Task {failed} is not childTask of {this}");
+        this.childTasks.Remove(failed);
+        this.childTasks.Add(newTask);
     }
     
     /// <summary>
diff --git a/Tranga/TrangaTasks/UpdateLibrariesTask.cs b/Tranga/TrangaTasks/UpdateLibrariesTask.cs
index ef94a13..c8d4f04 100644
--- a/Tranga/TrangaTasks/UpdateLibrariesTask.cs
+++ b/Tranga/TrangaTasks/UpdateLibrariesTask.cs
@@ -8,8 +8,10 @@ public class UpdateLibrariesTask : TrangaTask
     {
     }
 
-    protected override void ExecuteTask(TaskManager taskManager, Logger? logger)
+    protected override void ExecuteTask(TaskManager taskManager, Logger? logger, CancellationToken? cancellationToken = null)
     {
+        if (cancellationToken?.IsCancellationRequested??false)
+            return;
         foreach(LibraryManager lm in taskManager.settings.libraryManagers)
             lm.UpdateLibrary();
         this.progress = 1f;