diff --git a/CreamInstaller/Forms/InstallForm.cs b/CreamInstaller/Forms/InstallForm.cs
index 1fb20fe..2712a32 100644
--- a/CreamInstaller/Forms/InstallForm.cs
+++ b/CreamInstaller/Forms/InstallForm.cs
@@ -381,7 +381,10 @@ internal sealed partial class InstallForm : CustomForm
                         UseProxy = selection.UseProxy,
                         ProxyDllName = selection.UseProxy ? selection.Proxy ?? Selection.DefaultProxy : null,
                         UseExtraProtection = selection.UseExtraProtection,
-                        Dlc = selection.DLC.Select(dlc => new InstalledDlcRecord
+                        Dlc = selection.DLC
+                            .GroupBy(dlc => dlc.Id)
+                            .Select(g => g.First())
+                            .Select(dlc => new InstalledDlcRecord
                         {
                             DlcType = dlc.Type.ToString(),
                             Id = dlc.Id,
diff --git a/CreamInstaller/Forms/MainForm.cs b/CreamInstaller/Forms/MainForm.cs
index 2ae30eb..85537af 100644
--- a/CreamInstaller/Forms/MainForm.cs
+++ b/CreamInstaller/Forms/MainForm.cs
@@ -1158,10 +1158,12 @@ internal sealed partial class MainForm : CustomForm
                 if (selection.TreeNode.TreeView is null)
                     _ = selectionTreeView.Nodes.Add(selection.TreeNode);
 
-                // Restore DLC children from saved record
+                // Restore DLC children from saved record, deduplicating by ID
                 if (record.Dlc != null && record.Dlc.Count > 0)
                 {
-                    foreach (InstalledDlcRecord dlcRecord in record.Dlc)
+                    foreach (InstalledDlcRecord dlcRecord in record.Dlc
+                        .GroupBy(d => d.Id)
+                        .Select(g => g.First()))
                     {
                         if (!Enum.TryParse(dlcRecord.DlcType, out DLCType dlcType))
                             continue;
@@ -1476,7 +1478,10 @@ internal sealed partial class MainForm : CustomForm
                     UseProxy = existing?.UseProxy ?? false,
                     ProxyDllName = existing?.UseProxy == true ? existing.ProxyDllName : null,
                     UseExtraProtection = existing?.UseExtraProtection ?? false,
-                    Dlc = selection.DLC.Select(dlc => new InstalledDlcRecord
+                    Dlc = selection.DLC
+                        .GroupBy(dlc => dlc.Id)
+                        .Select(g => g.First())
+                        .Select(dlc => new InstalledDlcRecord
                     {
                         DlcType = dlc.Type.ToString(),
                         Id = dlc.Id,
diff --git a/CreamInstaller/SelectionDLC.cs b/CreamInstaller/SelectionDLC.cs
index e5382e0..3258625 100644
--- a/CreamInstaller/SelectionDLC.cs
+++ b/CreamInstaller/SelectionDLC.cs
@@ -71,7 +71,20 @@ internal sealed class SelectionDLC : IEquatable<SelectionDLC>
                                  Type == other.Type && GameId == other.GameId && Id == other.Id);
 
     internal static SelectionDLC GetOrCreate(DLCType type, string gameId, string id, string name)
-        => FromId(type, gameId, id) ?? new SelectionDLC(type, gameId, id, name);
+    {
+        // For Steam DLCs, Steam and SteamHidden represent the same DLC discovered
+        // through different code paths. Look up by (gameId, id) ignoring the Steam
+        // subtype to prevent duplicate entries for the same DLC.
+        if (type is DLCType.Steam or DLCType.SteamHidden)
+        {
+            SelectionDLC existing = All.Keys.FirstOrDefault(
+                dlc => dlc.GameId == gameId && dlc.Id == id
+                       && dlc.Type is DLCType.Steam or DLCType.SteamHidden);
+            if (existing is not null)
+                return existing;
+        }
+        return FromId(type, gameId, id) ?? new SelectionDLC(type, gameId, id, name);
+    }
 
     internal static SelectionDLC FromId(DLCType type, string gameId, string dlcId)
         => All.Keys.FirstOrDefault(dlc => dlc.Type == type && dlc.GameId == gameId && dlc.Id == dlcId);