kdk_handler: Verify path before iterating over

gui/gui_main.py

@@ -2446,7 +2446,8 @@ class wx_python_gui:
         self.gpu_dropdown.Bind(wx.EVT_CHOICE, self.gpu_selection_click)
         self.gpu_dropdown.Centre(wx.HORIZONTAL)
         self.gpu_dropdown.SetToolTip(wx.ToolTip("Configures MXM GPU Vendor logic on pre-built models\nIf you are not using MXM iMacs, please leave this setting as is."))
-        if self.computer.real_model not in ["iMac10,1", "iMac11,1", "iMac11,2", "iMac11,3", "iMac12,1", "iMac12,2"]:
+        models = ["iMac10,1", "iMac11,1", "iMac11,2", "iMac11,3", "iMac12,1", "iMac12,2"]
+        if (not self.constants.custom_model and self.computer.real_model not in models) or (self.constants.custom_model and self.constants.custom_model not in models):
             self.gpu_dropdown.Disable()
 
         # Disable Thunderbolt

resources/kdk_handler.py

@@ -170,8 +170,9 @@ class kernel_debug_kit_handler:
         return False, error_msg
 
     def is_kdk_installed(self, build):
-        for file in Path("/Library/Developer/KDKs").iterdir():
+        if Path("/Library/Developer/KDKs").exists():
-            if file.is_dir():
+            for file in Path("/Library/Developer/KDKs").iterdir():
-                if build in file.name:
+                if file.is_dir():
-                    return True
+                    if build in file.name:
+                        return True
         return False