I appreciate you dedicating your time to go through all the necessary troubleshooting steps to isolate the issue, @Richard860.

I understand your frustration with the freezing issues you're experiencing in QuickBooks Desktop (QBDT) Pro 2019. It can be disappointing when support for a version ends, and upgrading to a newer version requires a monthly fee instead of a one-time purchase. 

Given that you have already tried all the available fixes and the issue persists, contacting QuickBooks Desktop support would be the best route to take at this moment. They have the expertise to provide you with specific troubleshooting steps and guidance tailored to your situation. They may be able to offer further assistance or suggest alternative solutions to address the freezing problem.

While there may not be a specific download available to fix the problem, the support team can help you explore all possible options to resolve the issue and ensure the smooth functioning of your QuickBooks Desktop.
 

Moreover, I'll also provide this link where you can browse for articles that can guide you in managing your QBDT file: QuickBooks Desktop Help Articles.

I'm looking forward to resolving this issue. If you have any additional questions or concerns related to QuickBooks, please leave a reply. I'm available and ready to assist you at any time.