setup: handle incompatible versions (#36520)

check

system/ui/setup.py

@@ -4,6 +4,7 @@ import re
 import threading
 import time
 import urllib.request
+import urllib.error
 from urllib.parse import urlparse
 from enum import IntEnum
 import shutil
@@ -418,6 +419,10 @@ class Setup(Widget):
       time.sleep(0.1)
       gui_app.request_close()
 
+    except urllib.error.HTTPError as e:
+      if e.code == 409:
+        error_msg = e.read().decode("utf-8")
+        self.download_failed(self.download_url, error_msg)
     except Exception:
       error_msg = "Ensure the entered URL is valid, and the device's internet connection is good."
       self.download_failed(self.download_url, error_msg)