diff --git a/UnityLauncherPro/MainWindow.xaml b/UnityLauncherPro/MainWindow.xaml
index c382b16..1855248 100644
--- a/UnityLauncherPro/MainWindow.xaml
+++ b/UnityLauncherPro/MainWindow.xaml
@@ -512,12 +512,10 @@
                             <Label Content="Download &amp; Install" Foreground="{Binding Path=Foreground, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Control}}}" />
                         </Button>
                         <Button Grid.Column="3" Style="{StaticResource CustomButton}" x:Name="btnOpenWebsite"  Margin="5,0,0,0" BorderBrush="{x:Null}" Click="BtnOpenWebsite_Click" >
-                        </Button>
-                        <Button Grid.Column="3" Style="{StaticResource CustomButton}" x:Name="btnOpenWebsite_Copy"  Margin="5,0,0,0" BorderBrush="{x:Null}" Click="BtnOpenWebsite_Click" >
                             <Label Content="Release Notes" Foreground="{Binding Foreground, RelativeSource={RelativeSource AncestorType={x:Type Control}, Mode=FindAncestor}}" />
                         </Button>
-                        <Button Grid.Column="4" Style="{StaticResource CustomButton}" x:Name="btnOpenWebsite_Copy2"  Margin="5,0,0,0" BorderBrush="{x:Null}" Click="BtnOpenWebsite_Click" ToolTip="Show All Release notes between this version on the older, closest one installed.&lt;br&gt;Only works for final versions." >
-                            <Label Content="Cumulated Release Notes" Foreground="{Binding Foreground, RelativeSource={RelativeSource AncestorType={x:Type Control}, Mode=FindAncestor}}" />
+                        <Button Grid.Column="4" Style="{StaticResource CustomButton}" x:Name="btnShowCumulatedReleaseNotes"  Margin="5,0,0,0" BorderBrush="{x:Null}" Click="BtnShowCumulatedReleaseNotes_Click" ToolTip="Show all Release Notes between the selected version and the older, closest one installed. Only works for final and patch versions." >
+                            <Label Content="Cumulative Release Notes" Foreground="{Binding Foreground, RelativeSource={RelativeSource AncestorType={x:Type Control}, Mode=FindAncestor}}" />
                         </Button>
                     </Grid>
                 </Grid>
diff --git a/UnityLauncherPro/MainWindow.xaml.cs b/UnityLauncherPro/MainWindow.xaml.cs
index 311331f..14c823b 100644
--- a/UnityLauncherPro/MainWindow.xaml.cs
+++ b/UnityLauncherPro/MainWindow.xaml.cs
@@ -140,6 +140,7 @@ void Start()
 
             // clear updates grid
             dataGridUpdates.Items.Clear();
+            dataGridUpdates.SelectionChanged += DataGridUpdates_SelectionChanged;
 
             // clear buildreport grids
             gridBuildReport.Items.Clear();
@@ -177,6 +178,18 @@ void Start()
             isInitializing = false;
         }
 
+        private void DataGridUpdates_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            var selectedUp = GetSelectedUpdate();
+            bool showCumulative = false;
+            if (selectedUp != null)
+            {
+                var unityVer = GetSelectedUpdate().Version;
+                showCumulative = Tools.HasAlphaReleaseNotes(unityVer);
+            }
+            btnShowCumulatedReleaseNotes.IsEnabled = showCumulative;
+        }
+
         // bring old window to front, but needs matching appname.. https://stackoverflow.com/a/36804161/5452781
         private static void ActivateOtherWindow()
         {
@@ -1542,6 +1555,12 @@ private void BtnOpenWebsite_Click(object sender, RoutedEventArgs e)
             Tools.OpenReleaseNotes(unity?.Version);
         }
 
+        private void BtnShowCumulatedReleaseNotes_Click(object sender, RoutedEventArgs e)
+        {
+            var unity = GetSelectedUpdate();
+            Tools.OpenReleaseNotes_Cumulative(unity?.Version);
+        }
+
         private void ChkMinimizeToTaskbar_CheckedChanged(object sender, RoutedEventArgs e)
         {
             if (this.IsActive == false) return; // dont run code on window init
diff --git a/UnityLauncherPro/Tools.cs b/UnityLauncherPro/Tools.cs
index e0c91a0..08f10bd 100644
--- a/UnityLauncherPro/Tools.cs
+++ b/UnityLauncherPro/Tools.cs
@@ -588,36 +588,20 @@ public static bool VersionIsChinese(string version)
 
 
         //as of 21 May 2021, only final 'f' versions are now available on the alpha release notes for Unity 2018 and newer. 2017 and 5 still have patch 'p' versions as well.
-        public static bool HasAlphaReleaseNotes(string version) => version.Contains("f") || version.Contains("p");
+        public static bool HasAlphaReleaseNotes(string version) => VersionIsArchived(version) || VersionIsPatch(version);
+
+        public static string GetAlphaReleaseNotesURL(string fromVersion, string toVersion = null) 
+            => "https://alpha.release-notes.ds.unity3d.com/search?fromVersion=" + fromVersion + "&toVersion=" + (toVersion != null ? toVersion : fromVersion);
 
         // open release notes page in browser
         public static bool OpenReleaseNotes(string version)
         {
             bool result = false;
             if (string.IsNullOrEmpty(version)) return false;
-
             string url = null;
-            if (Properties.Settings.Default.useAlphaReleaseNotes && HasAlphaReleaseNotes(version))
+            if(Properties.Settings.Default.useAlphaReleaseNotes && HasAlphaReleaseNotes(version))
             {
-                //with the alpha release notes, we want a diff between an installed version and the one selected, but the site just shows all the changes inclusive of "fromVersion=vers"
-                //so if we find a good installed candidate, we need the version just above it (installed or not) that has release notes page
-                var comparisonVersion = version;
-                var closestInstalledVersion = Tools.FindNearestVersion(version, MainWindow.unityInstalledVersions.Keys.ToList(), true);
-                if (closestInstalledVersion != null)
-                {
-                    comparisonVersion = closestInstalledVersion;
-                    string nextFinalVersionAfterInstalled = closestInstalledVersion;
-                    
-                    //wwe need a loop here, to find the nearest final version. It might be better to warn the user about this before opening the page.
-                    do
-                        nextFinalVersionAfterInstalled = Tools.FindNearestVersion(nextFinalVersionAfterInstalled, MainWindow.updatesAsStrings);
-                    while (nextFinalVersionAfterInstalled != null && !HasAlphaReleaseNotes(nextFinalVersionAfterInstalled));
-
-                    if (nextFinalVersionAfterInstalled != null) comparisonVersion = nextFinalVersionAfterInstalled;
-
-                }
-
-                url = "https://alpha.release-notes.ds.unity3d.com/search?fromVersion=" + comparisonVersion + "&toVersion=" + version;
+                url = GetAlphaReleaseNotesURL(version);
             }
             else
             {
@@ -630,6 +614,36 @@ public static bool OpenReleaseNotes(string version)
             return result;
         }
 
+        public static bool OpenReleaseNotes_Cumulative(string version)
+        {
+            bool result = false;
+            if (string.IsNullOrEmpty(version)) return false;
+
+            string url = null;
+            var comparisonVersion = version;
+            //with the alpha release notes, we want a diff between an installed version and the one selected, but the site just shows all the changes inclusive of "fromVersion=vers"
+            //so if we find a good installed candidate, we need the version just above it (installed or not) that has release notes page
+            var closestInstalledVersion = Tools.FindNearestVersion(version, MainWindow.unityInstalledVersions.Keys.ToList(), true);
+            if (closestInstalledVersion != null)
+            {
+                comparisonVersion = closestInstalledVersion;
+                string nextFinalVersionAfterInstalled = closestInstalledVersion;
+
+                //wwe need a loop here, to find the nearest final version. It might be better to warn the user about this before opening the page.
+                do
+                    nextFinalVersionAfterInstalled = Tools.FindNearestVersion(nextFinalVersionAfterInstalled, MainWindow.updatesAsStrings);
+                while (nextFinalVersionAfterInstalled != null && !HasAlphaReleaseNotes(nextFinalVersionAfterInstalled));
+
+                if (nextFinalVersionAfterInstalled != null) comparisonVersion = nextFinalVersionAfterInstalled;
+
+            }
+            url = GetAlphaReleaseNotesURL(comparisonVersion,version);
+            
+            OpenURL(url);
+            result = true;
+            return result;
+        }
+
         public static void OpenURL(string url)
         {
             Process.Start(url);