diff --git a/src/LegendaryGameInstaller.xaml b/src/LegendaryGameInstaller.xaml
index 000c2e6..1c1c697 100644
--- a/src/LegendaryGameInstaller.xaml
+++ b/src/LegendaryGameInstaller.xaml
@@ -69,19 +69,24 @@
             </StackPanel>
             <Border Grid.Row="4" Grid.Column="0" BorderThickness="2" Style="{DynamicResource HighlightBorder}" HorizontalAlignment="Left" VerticalAlignment="Bottom" Grid.ColumnSpan="2" Name="ExtraContentBrd" Visibility="Collapsed" Margin="0,0,0,5">
                 <Expander Header="{DynamicResource LOCLegendaryExtraContent}" Margin="2,2,5,2" HorizontalAlignment="Left">
-                    <ListBox BorderThickness="0" Name="ExtraContentLB" SelectionMode="Multiple" SelectionChanged="ExtraContentLB_SelectionChanged" Margin="5,0,5,5">
-                        <ListBox.Resources>
-                            <Style TargetType="ListBoxItem">
-                                <Setter Property="Template">
-                                    <Setter.Value>
-                                        <ControlTemplate TargetType="ListBoxItem">
-                                            <CheckBox Content="{Binding Value.Name}" IsChecked="{Binding RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}, Path=IsSelected}" ToolTip="{Binding Value.Description}" Margin="0,5,0,0"/>
-                                        </ControlTemplate>
-                                    </Setter.Value>
-                                </Setter>
-                            </Style>
-                        </ListBox.Resources>
-                    </ListBox>
+                    <StackPanel Orientation="Vertical">
+                        <ListBox BorderThickness="0" Name="ExtraContentLB" SelectionMode="Multiple" SelectionChanged="ExtraContentLB_SelectionChanged" Margin="5,0,5,5">
+                            <ListBox.Resources>
+                                <Style TargetType="ListBoxItem">
+                                    <Setter Property="Template">
+                                        <Setter.Value>
+                                            <ControlTemplate TargetType="ListBoxItem">
+                                                <CheckBox Content="{Binding Value.Name}" IsChecked="{Binding RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}, Path=IsSelected}" ToolTip="{Binding Value.Description}" Tag="{Binding Value.Is_dlc}" Margin="0,5,0,0" Name="ExtraContentLBChk" Unchecked="ExtraContentLBChk_Unchecked"/>
+                                            </ControlTemplate>
+                                        </Setter.Value>
+                                    </Setter>
+                                </Style>
+                            </ListBox.Resources>
+                        </ListBox>
+                        <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" Background="{DynamicResource PanelSeparatorBrush}" Margin="7,0,0,5" />
+                        <CheckBox Margin="7,0,0,5" Content="{DynamicResource LOCLegendaryCheckAllDlcs}" x:Name="AllDlcsChk" Checked="AllDlcsChk_Checked" Unchecked="AllDlcsChk_Unchecked" Visibility="Collapsed"/>
+                        <CheckBox Margin="7,0,0,5" Content="{DynamicResource LOCLegendaryCheckAllContent}" x:Name="AllOrNothingChk" Checked="AllOrNothingChk_Checked" Unchecked="AllOrNothingChk_Unchecked" />
+                    </StackPanel>
                 </Expander>
             </Border>
             <Border Grid.Row="5" Grid.Column="0" BorderThickness="2" Style="{DynamicResource HighlightBorder}" HorizontalAlignment="Left" VerticalAlignment="Bottom" Grid.ColumnSpan="2">
diff --git a/src/LegendaryGameInstaller.xaml.cs b/src/LegendaryGameInstaller.xaml.cs
index bd4d8c1..a67b850 100644
--- a/src/LegendaryGameInstaller.xaml.cs
+++ b/src/LegendaryGameInstaller.xaml.cs
@@ -31,6 +31,7 @@ public partial class LegendaryGameInstaller : UserControl
         public double downloadSizeNumber;
         public double installSizeNumber;
         private LegendaryGameInfo.Rootobject manifest;
+        public bool uncheckedByUser = true;
 
         public LegendaryGameInstaller()
         {
@@ -99,7 +100,7 @@ private async void InstallBtn_Click(object sender, RoutedEventArgs e)
                     selectedExtraContent.AddMissing("");
                     foreach (var selectedOption in ExtraContentLB.SelectedItems.Cast<KeyValuePair<string, LegendarySDLInfo>>().ToList())
                     {
-                        if (selectedOption.Value.Is_dlc == false)
+                        if (!selectedOption.Value.Is_dlc)
                         {
                             foreach (var tag in selectedOption.Value.Tags)
                             {
@@ -407,6 +408,7 @@ private async void LegendaryGameInstallerUC_Loaded(object sender, RoutedEventArg
                                 }
                             }
                         }
+                        AllDlcsChk.Visibility = Visibility.Visible;
                     }
                     if (extraContentInfo.Keys.Count > 0)
                     {
@@ -625,5 +627,54 @@ private async void RepairBtn_Click(object sender, RoutedEventArgs e)
                 await downloadManager.EnqueueJob(GameID, InstallerWindow.Title, downloadSize, installSize, downloadProperties);
             }
         }
+
+        private void AllDlcsChk_Checked(object sender, RoutedEventArgs e)
+        {
+            var dlcs = ExtraContentLB.Items.Cast<KeyValuePair<string, LegendarySDLInfo>>().Where(x => x.Value.Is_dlc).ToList();
+            foreach (var dlc in dlcs)
+            {
+                ExtraContentLB.SelectedItems.Add(dlc);
+            }
+        }
+
+        private void AllDlcsChk_Unchecked(object sender, RoutedEventArgs e)
+        {
+            if (uncheckedByUser)
+            {
+                var dlcs = ExtraContentLB.SelectedItems.Cast<KeyValuePair<string, LegendarySDLInfo>>().Where(x => x.Value.Is_dlc).ToList();
+                foreach (var dlc in dlcs)
+                {
+                    ExtraContentLB.SelectedItems.Remove(dlc);
+                }
+            }
+        }
+
+        private void ExtraContentLBChk_Unchecked(object sender, RoutedEventArgs e)
+        {
+            uncheckedByUser = false;
+            if (AllOrNothingChk.IsChecked == true)
+            {
+                AllOrNothingChk.IsChecked = false;
+            }
+            var extraCheckbox = sender as CheckBox;
+            if (AllDlcsChk.IsChecked == true && (bool)extraCheckbox.Tag)
+            {
+                AllDlcsChk.IsChecked = false;
+            }
+            uncheckedByUser = true;
+        }
+
+        private void AllOrNothingChk_Checked(object sender, RoutedEventArgs e)
+        {
+            ExtraContentLB.SelectAll();
+        }
+
+        private void AllOrNothingChk_Unchecked(object sender, RoutedEventArgs e)
+        {
+            if (uncheckedByUser)
+            {
+                ExtraContentLB.SelectedItems.Clear();
+            }
+        }
     }
 }
diff --git a/src/Localization/en_US.xaml b/src/Localization/en_US.xaml
index bf5c635..cf828be 100644
--- a/src/Localization/en_US.xaml
+++ b/src/Localization/en_US.xaml
@@ -94,4 +94,6 @@
   <sys:String x:Key="LOCLegendaryAlternativeExe">Alternative executable file</sys:String>
   <sys:String x:Key="LOCLegendaryCloudSaves">Cloud saves</sys:String>
   <sys:String x:Key="LOCLegendaryDisplayDownloadSpeedInBits">Display download speed in bits per second</sys:String>
+  <sys:String x:Key="LOCLegendaryCheckAllDlcs">Check all DLCs</sys:String>
+  <sys:String x:Key="LOCLegendaryCheckAllContent">Check all</sys:String>
 </ResourceDictionary>
\ No newline at end of file
diff --git a/src/LocalizationKeys.cs b/src/LocalizationKeys.cs
index e37d896..8570438 100644
--- a/src/LocalizationKeys.cs
+++ b/src/LocalizationKeys.cs
@@ -577,5 +577,13 @@ public static class LOC
         /// Display download speed in bits per second
         /// </summary>
         public const string LegendaryDisplayDownloadSpeedInBits = "LOCLegendaryDisplayDownloadSpeedInBits";
+        /// <summary>
+        /// Check all DLCs
+        /// </summary>
+        public const string LegendaryCheckAllDlcs = "LOCLegendaryCheckAllDlcs";
+        /// <summary>
+        /// Check all
+        /// </summary>
+        public const string LegendaryCheckAllContent = "LOCLegendaryCheckAllContent";
     }
 }