diff --git a/src/Umbraco.Core/EnumerableExtensions.cs b/src/Umbraco.Core/EnumerableExtensions.cs
index 0d199d1d0d..c455fadad7 100644
--- a/src/Umbraco.Core/EnumerableExtensions.cs
+++ b/src/Umbraco.Core/EnumerableExtensions.cs
@@ -92,18 +92,7 @@ namespace Umbraco.Core
             }
         }
 
-        /// <summary>The flatten list.</summary>
-        /// <param name="e">The items.</param>
-        /// <param name="f">The select child.</param>
-        /// <typeparam name="T">Item type</typeparam>
-        /// <returns>list of TItem</returns>
-        [EditorBrowsable(EditorBrowsableState.Never)]
-        [Obsolete("Do not use, use SelectRecursive instead which has far less potential of re-iterating an iterator which may cause significantly more SQL queries")]
-        public static IEnumerable<T> FlattenList<T>(this IEnumerable<T> e, Func<T, IEnumerable<T>> f)
-        {
-            return e.SelectMany(c => f(c).FlattenList(f)).Concat(e);
-        }
-
+        
         /// <summary>
         /// Returns true if all items in the other collection exist in this collection
         /// </summary>
diff --git a/src/Umbraco.Tests/CoreThings/EnumerableExtensionsTests.cs b/src/Umbraco.Tests/CoreThings/EnumerableExtensionsTests.cs
index 7d7dcaea71..01b3adb383 100644
--- a/src/Umbraco.Tests/CoreThings/EnumerableExtensionsTests.cs
+++ b/src/Umbraco.Tests/CoreThings/EnumerableExtensionsTests.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
 using Umbraco.Core;
@@ -38,7 +39,7 @@ namespace Umbraco.Tests.CoreThings
         }
 
         [Test]
-        public void Flatten_List_2()
+        public void SelectRecursive_2()
         {
             var hierarchy = new TestItem("1")
             {
@@ -51,7 +52,7 @@ namespace Umbraco.Tests.CoreThings
                 };
 
 #pragma warning disable CS0618 // Type or member is obsolete
-            var flattened = hierarchy.Children.FlattenList(x => x.Children);
+            var flattened = FlattenList(hierarchy.Children, x => x.Children);
 #pragma warning restore CS0618 // Type or member is obsolete
             var selectRecursive = hierarchy.Children.SelectRecursive(x => x.Children);
 
@@ -62,7 +63,7 @@ namespace Umbraco.Tests.CoreThings
         }
 
         [Test]
-        public void Flatten_List()
+        public void SelectRecursive()
         {
             var hierarchy = new TestItem("1")
             {
@@ -118,7 +119,7 @@ namespace Umbraco.Tests.CoreThings
             };
 
 #pragma warning disable CS0618 // Type or member is obsolete
-            var flattened = hierarchy.Children.FlattenList(x => x.Children);
+            var flattened = FlattenList(hierarchy.Children, x => x.Children);
 #pragma warning restore CS0618 // Type or member is obsolete
             var selectRecursive = hierarchy.Children.SelectRecursive(x => x.Children);
 
@@ -141,6 +142,13 @@ namespace Umbraco.Tests.CoreThings
             public IEnumerable<TestItem> Children { get; set; }
         }
 
+
+
+        private IEnumerable<T> FlattenList<T>(IEnumerable<T> e, Func<T, IEnumerable<T>> f)
+        {
+            return e.SelectMany(c => FlattenList(f(c), f)).Concat(e);
+        }
+
         [Test]
         public void InGroupsOf_ReturnsAllElements()
         {
diff --git a/src/Umbraco.Web/Cache/DistributedCacheExtensions.cs b/src/Umbraco.Web/Cache/DistributedCacheExtensions.cs
index 0696595ef4..68ac339a46 100644
--- a/src/Umbraco.Web/Cache/DistributedCacheExtensions.cs
+++ b/src/Umbraco.Web/Cache/DistributedCacheExtensions.cs
@@ -74,25 +74,6 @@ namespace Umbraco.Web.Cache
 
         #endregion
 
-        #region User group permissions cache
-
-        public static void RemoveUserGroupPermissionsCache(this DistributedCache dc, int groupId)
-        {
-            dc.Remove(UserGroupPermissionsCacheRefresher.UniqueId, groupId);
-        }
-
-        public static void RefreshUserGroupPermissionsCache(this DistributedCache dc, int groupId)
-        {
-            //TODO: Not sure if we need this yet depends if we start caching permissions
-            //dc.Refresh(UserGroupPermissionsCacheRefresher.UniqueId, groupId);
-        }
-
-        public static void RefreshAllUserGroupPermissionsCache(this DistributedCache dc)
-        {
-            dc.RefreshAll(UserGroupPermissionsCacheRefresher.UniqueId);
-        }
-
-        #endregion
 
         #region TemplateCache
 
diff --git a/src/Umbraco.Web/Editors/EntityController.cs b/src/Umbraco.Web/Editors/EntityController.cs
index 313693c08c..b273d94691 100644
--- a/src/Umbraco.Web/Editors/EntityController.cs
+++ b/src/Umbraco.Web/Editors/EntityController.cs
@@ -226,13 +226,7 @@ namespace Umbraco.Web.Editors
             };
         }
 
-        [Obsolete("Use GetyById instead")]
-        [EditorBrowsable(EditorBrowsableState.Never)]
-        public EntityBasic GetByKey(Guid id, UmbracoEntityTypes type)
-        {
-            return GetResultForKey(id, type);
-        }
-
+     
         /// <summary>
         /// Gets an entity by a xpath query
         /// </summary>
diff --git a/src/Umbraco.Web/Umbraco.Web.csproj b/src/Umbraco.Web/Umbraco.Web.csproj
index f85ba9b494..ec4ccae121 100644
--- a/src/Umbraco.Web/Umbraco.Web.csproj
+++ b/src/Umbraco.Web/Umbraco.Web.csproj
@@ -109,7 +109,6 @@
     <Compile Include="AspNetHttpContextAccessor.cs" />
     <Compile Include="Cache\ContentCacheRefresher.cs" />
     <Compile Include="Cache\UserGroupCacheRefresher.cs" />
-    <Compile Include="Cache\UserGroupPermissionsCacheRefresher.cs" />
     <Compile Include="Components\BackOfficeUserAuditEventsComponent.cs" />
     <Compile Include="Editors\BackOfficePreviewModel.cs" />
     <Compile Include="Media\Exif\BitConverterEx.cs" />
diff --git a/src/Umbraco.Web/_Legacy/Packager/Installer.cs b/src/Umbraco.Web/_Legacy/Packager/Installer.cs
index 952f1987a4..3613fc7f87 100644
--- a/src/Umbraco.Web/_Legacy/Packager/Installer.cs
+++ b/src/Umbraco.Web/_Legacy/Packager/Installer.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.ComponentModel;
 using System.Globalization;
 using System.IO;
 using System.Xml;
@@ -14,7 +13,6 @@ using Umbraco.Core.Models;
 using Umbraco.Core.Composing;
 using Umbraco.Core.Events;
 using Umbraco.Core.Models.Packaging;
-using Umbraco.Core.Services;
 using Umbraco.Core.Services.Implement;
 using Umbraco.Core.Xml;
 using File = System.IO.File;
@@ -115,11 +113,7 @@ namespace umbraco.cms.businesslogic.packager
             ContainsStyleSheeConflicts = false;
         }
 
-        [Obsolete("Use the ctor with all parameters")]
-        [EditorBrowsable(EditorBrowsableState.Never)]
-        public Installer(string name, string version, string url, string license, string licenseUrl, string author, string authorUrl, int requirementsMajor, int requirementsMinor, int requirementsPatch, string readme, string control)
-        {
-        }
+
 
         /// <summary>
         /// Constructor