Some machines don't have Ethernet, imitating Ethernet to realize normal APP download function.
-Add SSDT-LAN to OC\ACPI.
-Add NullEthernet.kext to OC\Kexts.
-Add related lists in config.
-Open Network in System Preferences.
-Delete all networks, as shown in "Clear All Networks".
-Delete the Resource Library\Preferences\SystemConfiguration\NetworkInterfaces.plist file.
-Restart.
-After entering the system again, open Network of System Preferences again.
-Add Ethernet and other required networks in sequence, and click Apply.