Thank you for upgrading your QuickBooks. I can help you upload all your data in the QuickBooks Desktop Mac 2019.
Before we begin, make sure that your QuickBooks is updated and you comply with the system requirements. When using the newer version, you'll have to save your company file to your Documents and restore it.
Here's how to restore a file:
From the QuickBooks menu, select Preferences.
Click Attached Documents Library menu and choose Select Existing.
That should help you upload and open your data on the QB Mac 2019, awiddess. Let me know if there's anything else you need or you have additional questions. Just leave a comment below. Wishing you all the best.