diff --git a/src/RhinoInside.Revit.Loader/Loader.cs b/src/RhinoInside.Revit.Loader/Loader.cs
index 864390746..95c0d70a4 100644
--- a/src/RhinoInside.Revit.Loader/Loader.cs
+++ b/src/RhinoInside.Revit.Loader/Loader.cs
@@ -59,79 +59,83 @@ static Distribution PickDistribution()
 #endif
       };
 
-      var currentKey = Distribution.CurrentKey;
-      var available = distributions.Where(x => x.Available && (currentKey is null || x.RegistryKey == currentKey)).ToArray();
-
-      switch (available.Length)
+      var minVersion = distributions.OrderBy(x => x.MajorVersion).Select(x => x.MajorVersion).FirstOrDefault();
+      if (minVersion > default(int))
       {
-        case 0:
-          using
-          (
-            var taskDialog = new TaskDialog("Install Rhino")
-            {
-              Id = $"{MethodBase.GetCurrentMethod().DeclaringType}.{MethodBase.GetCurrentMethod().Name}.InstallRhino",
-              MainIcon = TaskDialogIcon.TaskDialogIconWarning,
-              AllowCancellation = true,
-              MainInstruction = "Rhino is not available",
-              MainContent = "Rhino.Inside Revit requires Rhino 7 or 8 installed on the computer.",
-              CommonButtons = TaskDialogCommonButtons.Close
-            }
-          )
-          {
-            taskDialog.AddCommandLink(TaskDialogCommandLinkId.CommandLink1, "Download Rhino…");
-            if (taskDialog.Show() == TaskDialogResult.CommandLink1)
+        var currentKey = Distribution.CurrentKey;
+        var available = distributions.Where(x => x.Available && (currentKey is null || x.RegistryKey == currentKey)).ToArray();
+
+        switch (available.Length)
+        {
+          case 0:
+            using
+            (
+              var taskDialog = new TaskDialog("Install Rhino")
+              {
+                Id = $"{MethodBase.GetCurrentMethod().DeclaringType}.{MethodBase.GetCurrentMethod().Name}.InstallRhino",
+                MainIcon = TaskDialogIcon.TaskDialogIconWarning,
+                AllowCancellation = true,
+                MainInstruction = "Rhino is not available",
+                MainContent = $"Rhino.Inside Revit requires Rhino {minVersion} or {minVersion + 1} installed on the computer.",
+                CommonButtons = TaskDialogCommonButtons.Close
+              }
+            )
             {
-              try
+              taskDialog.AddCommandLink(TaskDialogCommandLinkId.CommandLink1, "Download Rhino…");
+              if (taskDialog.Show() == TaskDialogResult.CommandLink1)
               {
-                Process.Start(new ProcessStartInfo($@"https://www.rhino3d.com/download/rhino/")
+                try
                 {
-                  UseShellExecute = true,
-                  WorkingDirectory = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)
-                });
+                  Process.Start(new ProcessStartInfo($@"https://www.rhino3d.com/download/rhino/")
+                  {
+                    UseShellExecute = true,
+                    WorkingDirectory = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)
+                  });
+                }
+                catch { }
               }
-              catch { }
             }
-          }
 
-          break;
+            break;
 
-        case 1:
-          return available[0];
+          case 1:
+            return available[0];
 
-        default:
-          using
-          (
-            var taskDialog = new TaskDialog("Loading…")
-            {
-              Id = typeof(Distribution).FullName,
-              MainIcon = TaskDialogIcon.TaskDialogIconInformation,
-              TitleAutoPrefix = true,
-              AllowCancellation = false,
-              MainInstruction = "Looks like you have many supported Rhino versions installed.",
-              MainContent = "Please pick which one you want to use in this Revit session.",
-              //VerificationText = "Do not show again"
-            }
-          )
-          {
-            for (int d = 0; d < 4 && d < Math.Min(available.Length, 4); d++)
+          default:
+            using
+            (
+              var taskDialog = new TaskDialog("Loading…")
+              {
+                Id = typeof(Distribution).FullName,
+                MainIcon = TaskDialogIcon.TaskDialogIconInformation,
+                TitleAutoPrefix = true,
+                AllowCancellation = false,
+                MainInstruction = "Looks like you have many supported Rhino versions installed.",
+                MainContent = "Please pick which one you want to use in this Revit session.",
+                //VerificationText = "Do not show again"
+              }
+            )
             {
-              var distribution = available[d];
-              taskDialog.AddCommandLink
-              (
-                TaskDialogCommandLinkId.CommandLink1 + d,
-                distribution.VersionInfo.FileDescription,
-                $"{distribution.ExeVersion()}"
-              );
-            }
+              for (int d = 0; d < 4 && d < Math.Min(available.Length, 4); d++)
+              {
+                var distribution = available[d];
+                taskDialog.AddCommandLink
+                (
+                  TaskDialogCommandLinkId.CommandLink1 + d,
+                  distribution.VersionInfo.FileDescription,
+                  $"{distribution.ExeVersion()}"
+                );
+              }
 
-            taskDialog.DefaultButton = TaskDialogResult.CommandLink1;
+              taskDialog.DefaultButton = TaskDialogResult.CommandLink1;
 
-            var result = taskDialog.Show();
+              var result = taskDialog.Show();
 
-            if (TaskDialogResult.CommandLink1 <= result && result <= TaskDialogResult.CommandLink4)
-              return available[result - TaskDialogResult.CommandLink1];
-          }
-          break;
+              if (TaskDialogResult.CommandLink1 <= result && result <= TaskDialogResult.CommandLink4)
+                return available[result - TaskDialogResult.CommandLink1];
+            }
+            break;
+        }
       }
 
       return null;