1: The network is not smooth and the delay is high.
2: The Apple server is busy and temporarily unavailable.
3. System network settings are wrong.
It is recommended to restore the network settings before downloading.
The operation is:
1. Click "Settings" on the main interface of the machine to open "Flight Mode".
2. Open "General" in the "Settings" interface and select "Restore":
3. Select "Restore Network Settings".