I can only amplify all of the frustration already expressed in this thread. If you wish to make sure that QuickBooks never talks to the Internet ever again, you will need to configure an Outbound Rule in Windows Firewall. It's complicated, but I don't know of any other solution. Attached are screen captures of the Windows Defender Firewall settings that will allow QuickBooks to talk to any servers on your local network, but prohibit it from talking to the Internet.