Migration of Quickbooks version6 data

Welcome to the Community, @naka.

I'd be glad to provide you with some information on this issue.

As of January 14, 2020, Microsoft no longer supports PCs running Windows 7. A computer running on Windows 7 will be more vulnerable to viruses and security risks. This is why Microsoft recommends upgrading to Windows 10. Below is a link that can give you some insight into Windows 7.

• Windows 7 support

You'll need to upgrade to Windows 10 before moving your company file to ensure that no damage is done to your file.

Afterward, I suggest contacting our Support Team so they can help you upgrade your QuickBooks Desktop account to the newest version. They have additional tools to help upgrade and migrate your company file.

1. Go to Help.
2. Press QuickBooks Desktop Help.
3. Select Contact Us.
4. Give a brief message about your issue, then click Continue.
5. Scroll down and choose to Get a Callback.

I want to ensure that you're taken care of, so if you need further assistance, let me know. Have a fantastic day!

@naka 

Call and ask Intuit Data Service to convert your data file to be able open on QuickBooks 2020. Should you need to resolve it in due course, consider purchasing a 3rd party conversion service.