Use PublishedFile.GetItemDetails when looking up pubfiles. This also requires -app to be specified with -pubfile.

DepotDownloader/ContentDownloader.cs

@@ -380,13 +380,13 @@ namespace DepotDownloader
             steam3.Disconnect();
         }
 
-        public static async Task DownloadPubfileAsync( ulong publishedFileId )
+        public static async Task DownloadPubfileAsync( uint appId, ulong publishedFileId )
         {
-            var details = steam3.GetPubfileDetails( publishedFileId );
+            var details = steam3.GetPubfileItemInfo( appId, publishedFileId );
 
-            if ( details.hcontent_file > 0 )
+            if ( details?.manifest_id > 0 )
             {
-                await DownloadAppAsync( details.consumer_appid, details.consumer_appid, details.hcontent_file, DEFAULT_BRANCH, null, null, null, false, true );
+                await DownloadAppAsync( appId, appId, details.manifest_id, DEFAULT_BRANCH, null, null, null, false, true );
             }
             else
             {

DepotDownloader/Program.cs

@@ -114,6 +114,13 @@ namespace DepotDownloader
 
             #endregion
 
+            uint appId = GetParameter<uint>( args, "-app", ContentDownloader.INVALID_APP_ID );
+            if ( appId == ContentDownloader.INVALID_APP_ID )
+            {
+                Console.WriteLine( "Error: -app not specified!" );
+                return 1;
+            }
+
             ulong pubFile = GetParameter<ulong>( args, "-pubfile", ContentDownloader.INVALID_MANIFEST_ID );
             if ( pubFile != ContentDownloader.INVALID_MANIFEST_ID )
             {
@@ -123,7 +130,7 @@ namespace DepotDownloader
                 {
                     try
                     {
-                        await ContentDownloader.DownloadPubfileAsync( pubFile ).ConfigureAwait( false );
+                        await ContentDownloader.DownloadPubfileAsync( appId, pubFile ).ConfigureAwait( false );
                     }
                     catch ( Exception ex ) when (
                         ex is ContentDownloaderException
@@ -179,13 +186,6 @@ namespace DepotDownloader
 
                 bool lv = HasParameter( args, "-lowviolence" );
 
-                uint appId = GetParameter<uint>( args, "-app", ContentDownloader.INVALID_APP_ID );
-                if ( appId == ContentDownloader.INVALID_APP_ID )
-                {
-                    Console.WriteLine( "Error: -app not specified!" );
-                    return 1;
-                }
-
                 uint depotId;
                 bool isUGC = false;
 
@@ -307,11 +307,13 @@ namespace DepotDownloader
         {
             Console.WriteLine();
             Console.WriteLine( "Usage - downloading one or all depots for an app:" );
-            Console.WriteLine( "\tdepotdownloader -app <id> [-depot <id> [-manifest <id>] | [-ugc <id>]]" );
+            Console.WriteLine( "\tdepotdownloader -app <id> [-depot <id> [-manifest <id>]]" );
             Console.WriteLine( "\t\t[-username <username> [-password <password>]] [other options]" );
             Console.WriteLine();
-            Console.WriteLine( "Usage - downloading a Workshop item published via SteamUGC" );
+            Console.WriteLine("Usage - downloading a workshop item using pubfile id");
-            Console.WriteLine( "\tdepotdownloader -pubfile <id> [-username <username> [-password <password>]]" );
+            Console.WriteLine( "\tdepotdownloader -app <id> -pubfile <id> [-username <username> [-password <password>]]" );
+            Console.WriteLine("Usage - downloading a workshop item using ugc id");
+            Console.WriteLine("\tdepotdownloader -app <id> -ugc <id> [-username <username> [-password <password>]]");
             Console.WriteLine();
             Console.WriteLine( "Parameters:" );
             Console.WriteLine( "\t-app <#>\t\t\t\t- the AppID to download." );

DepotDownloader/Steam3Session.cs

@@ -388,21 +388,21 @@ namespace DepotDownloader
             }, () => { return completed; } );
         }
 
-        public PublishedFileDetails GetPubfileDetails( PublishedFileID pubFile )
+        public CPublishedFile_GetItemInfo_Response.WorkshopItemInfo GetPubfileItemInfo( uint appId, PublishedFileID pubFile )
         {
-            var pubFileRequest = new CPublishedFile_GetDetails_Request();
+            var pubFileRequest = new CPublishedFile_GetItemInfo_Request() { app_id = appId };
-            pubFileRequest.publishedfileids.Add( pubFile );
+            pubFileRequest.workshop_items.Add( new CPublishedFile_GetItemInfo_Request.WorkshopItem() { published_file_id = pubFile } );
 
             bool completed = false;
-            PublishedFileDetails details = null;
+            CPublishedFile_GetItemInfo_Response.WorkshopItemInfo details = null;
 
             Action<SteamUnifiedMessages.ServiceMethodResponse> cbMethod = callback =>
             {
                 completed = true;
                 if ( callback.Result == EResult.OK )
                 {
-                    var response = callback.GetDeserializedResponse<CPublishedFile_GetDetails_Response>();
+                    var response = callback.GetDeserializedResponse<CPublishedFile_GetItemInfo_Response>();
-                    details = response.publishedfiledetails[0];
+                    details = response.workshop_items.FirstOrDefault();
                 }
                 else
                 {
@@ -412,7 +412,7 @@ namespace DepotDownloader
 
             WaitUntilCallback(() =>
             {
-                callbacks.Subscribe( steamPublishedFile.SendMessage( api => api.GetDetails( pubFileRequest ) ), cbMethod );
+                callbacks.Subscribe( steamPublishedFile.SendMessage( api => api.GetItemInfo( pubFileRequest ) ), cbMethod );
             }, () => { return completed; });
 
             return details;