2 company files open after upgrading from 2023 to 2024 ?

I can share some insight about why you're unable to exchange data from your POS to QuickBooks Desktop (QBDT) 2024, 

As of October 3, 2023, QuickBooks Point of Sale 19.0 has been discontinued. Thus, you'll no longer be able to receive any security patches and updates from us. At the same time, these services will also stop:

• QuickBooks Point of Sale Payments
• QuickBooks Point of Sale Gift Card Service
• Mobile Sync
• Intuit Store Exchange
• Webgility E-commerce integration
• Support plans including live support (phone, email, chat)
• Vendor Lookup Service

Since Financial Data Exchange is one of the online services that Point of Sales offer, you'll no longer be able to access this assistance that allows you to manage and swap data from one program to another.

At the same time, please know that we have collaborated with Shopify to offer a retail solution that integrates with QuickBooks Desktop Financial Software easily.

You can read this article for reference and additional information: QuickBooks Desktop Point of Sale discontinuation.

If you encounter any issues while using QBDT, you can always visit this website and browse through articles that can help you resolve them: QBDT Self-Help Article.

Feel free to reply or post in this forum if you need further help in exchanging your POS data with QBDT. I'll be sure to look into it.