There are hundreds of replies on this, but I have found a very easy fix.. for me at least, this works flawless... What I did is this:

1) Install Quickbooks Desktop Pro 2020 from Disc, which comes default with Release 1. 

2) Set quickbooks automatic update preferences to: OFF

3) Manually install Qbwebpatch.exe release 5 (which I have the update file for, if anyone needs), which updates Quickbooks to release 5. (Note: Using the "update quickbooks" function will update quickbooks to version 15+ or whatever is most recent).

4) Manually create new company file and all new accounts, customers, invoices, etc...  manually. (You cannot convert a newer company file to an older version, so this must be done manually).

A smart person, actually reads the release notes. Release 6 says: "Admin is now required to sign in to their Intuit account when:
Creating a new company file
Opening an existing file"

So, because of this, simply installing release 5, the version prior to version 6, which does NOT require an admin account to sign into Intuit, completely fixes this problem 100%, permanently, and forever. It does not require firewall modifications, or anything. I have seen no message to login to an Intuit account, even if I was at gunpoint, as the software was not coded to require this, as it was in release 6.

Problem solved. You are welcome.