diff --git a/DepotDownloader/ContentDownloader.cs b/DepotDownloader/ContentDownloader.cs
index a905130d..51e16dd0 100644
--- a/DepotDownloader/ContentDownloader.cs
+++ b/DepotDownloader/ContentDownloader.cs
@@ -126,12 +126,10 @@ namespace DepotDownloader
                 SteamApps.PICSProductInfoCallback.PICSProductInfo package;
                 if ( steam3.PackageInfo.TryGetValue( license, out package ) && package != null )
                 {
-                    KeyValue root = package.KeyValues[license.ToString()];
-
-                    if ( root["appids"].Children.Any( child => child.AsInteger() == depotId ) )
+                    if ( package.KeyValues["appids"].Children.Any( child => child.AsInteger() == depotId ) )
                         return true;
 
-                    if ( root["depotids"].Children.Any( child => child.AsInteger() == depotId ) )
+                    if ( package.KeyValues["depotids"].Children.Any( child => child.AsInteger() == depotId ) )
                         return true;
                 }
             }
diff --git a/DepotDownloader/DepotDownloader.csproj b/DepotDownloader/DepotDownloader.csproj
index 52c72bc4..c699f33d 100644
--- a/DepotDownloader/DepotDownloader.csproj
+++ b/DepotDownloader/DepotDownloader.csproj
@@ -62,9 +62,9 @@
       <SpecificVersion>True</SpecificVersion>
       <HintPath>..\packages\protobuf-net.2.0.0.668\lib\net40\protobuf-net.dll</HintPath>
     </Reference>
-    <Reference Include="SteamKit2, Version=1.6.1.19114, Culture=neutral, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\SteamKit2.1.6.1\lib\net40\SteamKit2.dll</HintPath>
+    <Reference Include="SteamKit2, Version=1.6.4.32461, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\SteamKit2.1.6.4\lib\net40\SteamKit2.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core">
diff --git a/DepotDownloader/Steam3Session.cs b/DepotDownloader/Steam3Session.cs
index 41a78aa3..8918d930 100644
--- a/DepotDownloader/Steam3Session.cs
+++ b/DepotDownloader/Steam3Session.cs
@@ -1,15 +1,13 @@
-using System;
+using SteamKit2;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.IO;
 using System.Linq;
-using SteamKit2;
-using System.Diagnostics;
-using System.Net;
 
 namespace DepotDownloader
 {
-    
+
     class Steam3Session
     {
         public class Credentials
@@ -83,12 +81,12 @@ namespace DepotDownloader
 
             this.callbacks = new CallbackManager(this.steamClient);
 
-            this.callbacks.Register(new Callback<SteamClient.ConnectedCallback>(ConnectedCallback));
-            this.callbacks.Register(new Callback<SteamClient.DisconnectedCallback>(DisconnectedCallback));
-            this.callbacks.Register(new Callback<SteamUser.LoggedOnCallback>(LogOnCallback));
-            this.callbacks.Register(new Callback<SteamUser.SessionTokenCallback>(SessionTokenCallback));
-            this.callbacks.Register(new Callback<SteamApps.LicenseListCallback>(LicenseListCallback));
-            this.callbacks.Register(new Callback<SteamUser.UpdateMachineAuthCallback>(UpdateMachineAuthCallback));
+            this.callbacks.Subscribe<SteamClient.ConnectedCallback>(ConnectedCallback);
+            this.callbacks.Subscribe<SteamClient.DisconnectedCallback>(DisconnectedCallback);
+            this.callbacks.Subscribe<SteamUser.LoggedOnCallback>(LogOnCallback);
+            this.callbacks.Subscribe<SteamUser.SessionTokenCallback>(SessionTokenCallback);
+            this.callbacks.Subscribe<SteamApps.LicenseListCallback>(LicenseListCallback);
+            this.callbacks.Subscribe<SteamUser.UpdateMachineAuthCallback>(UpdateMachineAuthCallback);
 
             Console.Write( "Connecting to Steam3..." );
 
@@ -160,7 +158,7 @@ namespace DepotDownloader
             };
 
             WaitUntilCallback(() => { 
-                new Callback<SteamApps.PICSTokensCallback>(cbMethodTokens, callbacks, steamApps.PICSGetAccessTokens(new List<uint>() { appId }, new List<uint>() { }));
+                callbacks.Subscribe(steamApps.PICSGetAccessTokens(new List<uint>() { appId }, new List<uint>() { }), cbMethodTokens);
             }, () => { return completed; });
 
             completed = false;
@@ -189,8 +187,8 @@ namespace DepotDownloader
                 request.Public = false;
             }
 
-            WaitUntilCallback(() => { 
-                new Callback<SteamApps.PICSProductInfoCallback>(cbMethod, callbacks, steamApps.PICSGetProductInfo(new List<SteamApps.PICSRequest>() { request }, new List<SteamApps.PICSRequest>() { }));
+            WaitUntilCallback(() => {
+                callbacks.Subscribe(steamApps.PICSGetProductInfo(new List<SteamApps.PICSRequest>() { request }, new List<SteamApps.PICSRequest>() { }), cbMethod);
             }, () => { return completed; });
         }
 
@@ -219,8 +217,8 @@ namespace DepotDownloader
                 }
             };
 
-            WaitUntilCallback(() => { 
-                new Callback<SteamApps.PICSProductInfoCallback>(cbMethod, callbacks, steamApps.PICSGetProductInfo(new List<uint>(), packages));
+            WaitUntilCallback(() => {
+                callbacks.Subscribe(steamApps.PICSGetProductInfo(new List<uint>(), packages), cbMethod);
             }, () => { return completed; });
         }
 
@@ -254,7 +252,7 @@ namespace DepotDownloader
             };
 
             WaitUntilCallback(() => { 
-                new Callback<SteamApps.AppOwnershipTicketCallback>(cbMethod, callbacks, steamApps.GetAppOwnershipTicket(appId));
+                callbacks.Subscribe(steamApps.GetAppOwnershipTicket(appId), cbMethod);
             }, () => { return completed; });
         }
 
@@ -281,7 +279,7 @@ namespace DepotDownloader
 
             WaitUntilCallback(() =>
             {
-                new Callback<SteamApps.DepotKeyCallback>(cbMethod, callbacks, steamApps.GetDepotDecryptionKey(depotId, appid));
+                callbacks.Subscribe(steamApps.GetDepotDecryptionKey(depotId, appid), cbMethod);
             }, () => { return completed; });
         }
 
@@ -307,7 +305,7 @@ namespace DepotDownloader
 
             WaitUntilCallback(() =>
             {
-                new Callback<SteamApps.CDNAuthTokenCallback>(cbMethod, callbacks, steamApps.GetCDNAuthToken(depotid, host));
+                callbacks.Subscribe(steamApps.GetCDNAuthToken(depotid, host), cbMethod);
             }, () => { return completed; });
         }
 
diff --git a/DepotDownloader/packages.config b/DepotDownloader/packages.config
index 4f326067..9818fd47 100644
--- a/DepotDownloader/packages.config
+++ b/DepotDownloader/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="protobuf-net" version="2.0.0.668" targetFramework="net40" />
-  <package id="SteamKit2" version="1.6.3" targetFramework="net40" />
+  <package id="protobuf-net" version="2.0.0.668" targetFramework="net4" />
+  <package id="SteamKit2" version="1.6.4" targetFramework="net4" />
 </packages>
\ No newline at end of file