Original AddInManager now only shows its menu item (Tools menu), if AddInManager2 is not installed or enabled.

src/AddIns/Misc/AddInManager/Project/AddInManager.addin

@@ -11,13 +11,16 @@
 	<Runtime>
 		<Import assembly = "ICSharpCode.AddInManager.dll">
 			<ConditionEvaluator name="AddInManagerAddInState" class="ICSharpCode.AddInManager.AddInManagerAddInStateConditionEvaluator"/>
+			<ConditionEvaluator name="AddInManager2NotInstalled" class="ICSharpCode.AddInManager.AddInManager2NotInstalledConditionEvaluator"/>
 		</Import>
 	</Runtime>
 	
 	<Path name = "/SharpDevelop/Workbench/Tools">
-		<MenuItem id = "ShowAddInManager"
-		          label = "${res:AddInManager.Title}"
-		          class = "ICSharpCode.AddInManager.ShowCommand"/>
+		<Condition name="AddInManager2NotInstalled">
+			<MenuItem id = "ShowAddInManager"
+			          label = "${res:AddInManager.Title}"
+			          class = "ICSharpCode.AddInManager.ShowCommand"/>
+		</Condition>
 	</Path>
 	
 	<Path name = "/SharpDevelop/Workbench/DisplayBindings">

src/AddIns/Misc/AddInManager/Project/Src/Commands.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using ICSharpCode.Core;
+using System.Linq;
 
 #if !STANDALONE
 using ICSharpCode.SharpDevelop;
@@ -43,6 +44,24 @@ namespace ICSharpCode.AddInManager
 		}
 	}
 	
+	public class AddInManager2NotInstalledConditionEvaluator : IConditionEvaluator
+	{
+		public bool IsValid(object caller, Condition condition)
+		{
+			#if !STANDALONE
+			AddIn addInManager2AddIn = SD.AddInTree.AddIns.Where(
+				a => ((a.Manifest != null) && (a.Manifest.PrimaryIdentity == "ICSharpCode.AddInManager2")))
+				.FirstOrDefault();
+			if (addInManager2AddIn != null)
+			{
+				return !addInManager2AddIn.Enabled;
+			}
+			#endif
+			
+			return true;
+		}
+	}
+	
 	public class DisableCommand : AbstractMenuCommand
 	{
 		public override void Run()