Redownload after failure is an advanced option.

New: Handle failed downloads and attempt to find another release (SABnzbd only)

src/NzbDrone.Core/Configuration/ConfigService.cs

@@ -261,6 +261,13 @@ namespace NzbDrone.Core.Configuration
             set { SetValue("AutoDownloadPropers", value); }
         }
 
+        public Boolean AutoRedownloadFailed
+        {
+            get { return GetValueBoolean("AutoRedownloadFailed", true); }
+
+            set { SetValue("AutoRedownloadFailed", value); }
+        }
+
         public string DownloadClientWorkingFolders
         {
             get { return GetValue("DownloadClientWorkingFolders", "_UNPACK_|_FAILED_"); }

src/NzbDrone.Core/Configuration/IConfigService.cs

@@ -39,6 +39,7 @@ namespace NzbDrone.Core.Configuration
         Int32 RssSyncInterval { get; set; }
         Boolean AutoDownloadPropers { get; set; }
         String DownloadClientWorkingFolders { get; set; }
+        Boolean AutoRedownloadFailed { get; set; }
         void SaveValues(Dictionary<string, object> configValues);
     }
 }

src/NzbDrone.Core/Download/RedownloadFailedDownloadService.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using NLog;
+using NzbDrone.Core.Configuration;
 using NzbDrone.Core.IndexerSearch;
 using NzbDrone.Core.Messaging.Commands;
 using NzbDrone.Core.Tv;
@@ -15,12 +16,14 @@ namespace NzbDrone.Core.Download
 
     public class RedownloadFailedDownloadService : IRedownloadFailedDownloads
     {
+        private readonly IConfigService _configService;
         private readonly IEpisodeService _episodeService;
         private readonly ICommandExecutor _commandExecutor;
         private readonly Logger _logger;
 
-        public RedownloadFailedDownloadService(IEpisodeService episodeService, ICommandExecutor commandExecutor, Logger logger)
+        public RedownloadFailedDownloadService(IConfigService configService, IEpisodeService episodeService, ICommandExecutor commandExecutor, Logger logger)
         {
+            _configService = configService;
             _episodeService = episodeService;
             _commandExecutor = commandExecutor;
             _logger = logger;
@@ -28,6 +31,12 @@ namespace NzbDrone.Core.Download
 
         public void Redownload(int seriesId, List<int> episodeIds)
         {
+            if (!_configService.AutoRedownloadFailed)
+            {
+                _logger.Trace("Auto redownloading failed episodes is disabled");
+                return;
+            }
+
             if (episodeIds.Count == 1)
             {
                 _logger.Trace("Failed download only contains one episode, searching again");

src/UI/Settings/MediaManagement/FileManagement/FileManagementViewTemplate.html

@@ -41,6 +41,26 @@
         </div>
     </div>
 
+    <div class="control-group">
+        <label class="control-label">Redownload Failed</label>
+
+        <div class="controls">
+            <label class="checkbox toggle well">
+                <input type="checkbox" name="autoRedownloadFailed"/>
+                <p>
+                    <span>Yes</span>
+                    <span>No</span>
+                </p>
+
+                <div class="btn btn-primary slide-button"/>
+            </label>
+
+            <span class="help-inline-checkbox">
+                <i class="icon-question-sign" title="Should NzbDrone automatically search for and attempt to download another release when a download fails?"/>
+            </span>
+        </div>
+    </div>
+
     <div class="control-group">
         <label class="control-label">Recycling Bin</label>