Gets the installer steps working nicely and returning the next step to execute which now displays the current step details correctly and dequeues steps that are not required after the previous one has executed.

src/Umbraco.Web/Install/Models/InstallSetupStepAttribute.cs

@@ -13,7 +13,8 @@ namespace Umbraco.Web.Install.Models
             ServerOrder = serverOrder;
             Description = description;
 
-            var r = new Regex("", RegexOptions.Compiled | RegexOptions.Compiled);
+            //default
+            PerformsAppRestart = false;
         }
 
         public InstallSetupStepAttribute(InstallationType installTypeTarget, string name, int serverOrder, string description)
@@ -23,6 +24,9 @@ namespace Umbraco.Web.Install.Models
             View = string.Empty;
             ServerOrder = serverOrder;
             Description = description;
+
+            //default
+            PerformsAppRestart = false;
         }
 
         public InstallationType InstallTypeTarget { get; private set; }
@@ -30,5 +34,12 @@ namespace Umbraco.Web.Install.Models
         public string View { get; private set; }
         public int ServerOrder { get; private set; }
         public string Description { get; private set; }
+
+        /// <summary>
+        /// A flag to notify the installer that this step performs an app pool restart, this can be handy to know since if the current
+        /// step is performing a restart, we cannot 'look ahead' to see if the next step can execute since we won't know until the app pool
+        /// is restarted.
+        /// </summary>
+        public bool PerformsAppRestart { get; set; }
     }
 }