diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/BuildSettings.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/BuildSettings.cs
index 80a709ca7..b3a2156aa 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/BuildSettings.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/BuildSettings.cs
@@ -62,7 +62,15 @@ namespace Spine.Unity.Editor {
 					Shader.Find("tk2d/AdditiveVertexColor") != null);
 			}
 
+			internal static bool IsTK2DAllowed {
+				get {
+					return false; // replace with "return true;" to allow TK2D support
+				}
+			}
+
 			internal static void EnableTK2D () {
+				if (!IsTK2DAllowed)
+					return;
 				SpineBuildEnvUtility.DisableSpineAsmdefFiles();
 				SpineBuildEnvUtility.EnableBuildDefine(SPINE_TK2D_DEFINE);
 			}
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/Preferences.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/Preferences.cs
index 4178d9cd0..f8af00bf4 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/Preferences.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Utility/Preferences.cs
@@ -278,16 +278,28 @@ namespace Spine.Unity.Editor {
 					}
 				}
 
-				if (SpineTK2DEditorUtility.IsTK2DInstalled()) {
+				#if SPINE_TK2D_DEFINE
+				bool isTK2DDefineSet = true;
+				#else
+				bool isTK2DDefineSet = false;
+				#endif
+				bool isTK2DAllowed = SpineTK2DEditorUtility.IsTK2DAllowed;
+				if (SpineTK2DEditorUtility.IsTK2DInstalled() || isTK2DDefineSet) {
 					GUILayout.Space(20);
 					EditorGUILayout.LabelField("3rd Party Settings", EditorStyles.boldLabel);
 					using (new GUILayout.HorizontalScope()) {
 						EditorGUILayout.PrefixLabel("Define TK2D");
-						if (GUILayout.Button("Enable", GUILayout.Width(64)))
+						if (isTK2DAllowed && GUILayout.Button("Enable", GUILayout.Width(64)))
 							SpineTK2DEditorUtility.EnableTK2D();
 						if (GUILayout.Button("Disable", GUILayout.Width(64)))
 							SpineTK2DEditorUtility.DisableTK2D();
 					}
+					#if !SPINE_TK2D_DEFINE
+					if (!isTK2DAllowed) {
+						EditorGUILayout.LabelField("To allow TK2D support, please modify line 67 in", EditorStyles.boldLabel);
+						EditorGUILayout.LabelField("Spine/Editor/spine-unity/Editor/Util./BuildSettings.cs", EditorStyles.boldLabel);
+					}
+					#endif
 				}
 
 				GUILayout.Space(20);
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SpinePreferences.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SpinePreferences.cs
index f67922db8..55166779f 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SpinePreferences.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SpinePreferences.cs
@@ -192,16 +192,28 @@ namespace Spine.Unity.Editor {
 					}
 				}
 
-				if (SpineEditorUtilities.SpineTK2DEditorUtility.IsTK2DInstalled()) {
+				#if SPINE_TK2D_DEFINE
+				bool isTK2DDefineSet = true;
+				#else
+				bool isTK2DDefineSet = false;
+				#endif
+				bool isTK2DAllowed = SpineEditorUtilities.SpineTK2DEditorUtility.IsTK2DAllowed;
+				if (SpineEditorUtilities.SpineTK2DEditorUtility.IsTK2DInstalled() || isTK2DDefineSet) {
 					GUILayout.Space(20);
 					EditorGUILayout.LabelField("3rd Party Settings", EditorStyles.boldLabel);
 					using (new GUILayout.HorizontalScope()) {
 						EditorGUILayout.PrefixLabel("Define TK2D");
-						if (GUILayout.Button("Enable", GUILayout.Width(64)))
+						if (isTK2DAllowed && GUILayout.Button("Enable", GUILayout.Width(64)))
 							SpineEditorUtilities.SpineTK2DEditorUtility.EnableTK2D();
 						if (GUILayout.Button("Disable", GUILayout.Width(64)))
 							SpineEditorUtilities.SpineTK2DEditorUtility.DisableTK2D();
 					}
+					#if !SPINE_TK2D_DEFINE
+					if (!isTK2DAllowed) {
+						EditorGUILayout.LabelField("To allow TK2D support, please modify line 67 in", EditorStyles.boldLabel);
+						EditorGUILayout.LabelField("Spine/Editor/spine-unity/Editor/Util./BuildSettings.cs", EditorStyles.boldLabel);
+					}
+					#endif
 				}
 
 				GUILayout.Space(20);