Thank you for providing such a detailed explanation of your situation, The-IT-Guy. It's nice to see you being able to upload images, as your screenshot has truly helped me assess this situation. Your thorough efforts in troubleshooting, including multiple reinstallations and reaching out to support, are commendable. It's clear you've invested significant time and energy into resolving this issue. Let's work together to address both the connectivity problem with your workstation and the challenge of synchronizing data between the temporary backup and the main company file. 

After reviewing the provided screenshot, it appears that the connectivity problem is caused by the error codes you encountered. Specifically, the codes 6190 and 816 refer to issues related to the multi-user network and not with the data file itself. If you've ensured all your users are accessing the company file through multi-user mode and it isn't located in a read-only network folder, you'll need to troubleshoot these errors to ensure that you can continue working on your company files. Let's begin with downloading and installing the QuickBooks Tool Hub on the affected workstation. Here's how you can proceed: 

1. Close QuickBooks.
2. Download the most recent version (1.6.0.3) of the QuickBooks Tool Hub. Save the file somewhere you can easily find it.
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. When the install finishes, double-click the icon on your Windows desktop to open the tool hub.
   
6. Once the QuickBooks Tool Hub is open, select Program Problems.
7. Select Quick Fix my Program.
8. Start QuickBooks Desktop and open your data file.

If you still see the same errors, I'd recommend restarting all of your computers and servers. You can follow these steps in order. If you use:
 

• QuickBooks Enterprise Hosting instead of a server computer, reach out to us through chat so we can help you restart the service.
• One of our affiliated Intuit Hosting Providers or another online service to host your company files, contact them to help restart the service.

1. Restart your server computer (the one hosting your company files).
2. Restart each workstation (the other computers connected to the network that don’t host your company files).
3. Open QuickBooks Desktop on your server computer.
4. Open QuickBooks Desktop on each workstation.
    

Moreover. if you still face the similar issue after performed the abovementioned processes, you can follow the Solution 3 on this article: How to fix Error 6189, 816 and 6190, 816. 

Regarding the error codes 6000, - 83, these appears when you're attempting to open, restore, or back-up your company files. In this case, we'll need to perform a few basic diagnostic procedures to rectify these problems. If you keep your company file on a Windows server, you'll first need to turn off hosting on your workstations. For those using network-hosted company files, ensure that the Host Multi-User Access feature is deactivated on all workstations - these are the networked computers that don't directly host your company files. It's crucial that only your server computer is set up for hosting. I'll show you how: 

1. Open QuickBooks on one of your workstations.
2. Don't open your company file. Instead, navigate to the File menu and hover over Utilities.
3. If you see the "Host Multi-User Access" option, don’t choose it. Move on to the next workstation. This one isn’t causing the problem.
4. If Stop Hosting Multi-User Access is an option, select it.
   
5. Repeat these steps on all of your workstations.

In the event that the error -6000,-83 persists, proceed to Solution 2 outlined in the article: How to fix Error 6000,-83. 

Alternatively, if your company file isn't on a server and you see Error -6000,-83, I recommend contacting our live support team for further assistance.
 

Finally, combining company files or QBW files isn't available. Since each company file is unique and contains specific information, such as transactions, accounts, and preferences. Combining two or more company files can result in data duplication, errors, and conflicts, which can lead to incorrect financial reporting, loss of data, and legal and financial issues. Therefore, it's recommended to manage multiple company files separately and use tools such as import and export to transfer data between them when necessary.

Your patience and persistence are key in this process, The-IT-Guy. If you have questions while following these instructions, share them in the comments section below. I'm committed to working alongside you until we get your QuickBooks system back to optimal functionality. Your business operations are important to us, and we understand the impact these technical issues can have on your day-to-day activities. Rest assured, we'll continue to support you throughout this troubleshooting process and beyond, ensuring you can return to smooth, efficient operations as quickly as possible.