Good evening, @Promise3. 

Thanks for taking the time to follow along with the thread and sharing your concerns. 

Some of our most common reasons you see an Unrecoverable error message are missing Windows updates, damage to your company file, or computer issues. I've included some of our basic troubleshooting steps to clear the error below. 

First, let's try suppressing your QuickBooks. Here's how: 

1. Press and hold the Ctrl key.
2. Double-click your QuickBooks program icon.
3. Hold the Ctrl key until the No Company Open window shows.

Then let's suppress your company file. Here's how you can do that: 

1. Select the desired company file from the No Company Open window.
2. Press and hold the Alt key, then tap Open.
3. If you are prompted for your log-in information, release the Alt key, then enter your user name and password.
4. Press and hold the Alt key until the company file fully opens. 

For additional troubleshooting steps for an Unrecoverable error, check out Unrecoverable error general troubleshooting steps. 

When we see the error message "The connection has been lost," it's typically due to network-related issues. That said, I recommend contacting our Technical Support Team. This way, one of our tech agents can review the setup and make any necessary corrections. 

To connect with an agent directly:

• QuickBooks Desktop Support

Please let me know if you have any questions or concerns. Take care!