Hello there, @dianal.
You should be able to seamlessly start using the QuickBooks Desktop Pro 2019 program and import your company files after the installation and activation process. When you're unable to get past the password verification process there's a need to further check your account setup. With this, I'd recommend contacting our Customer Care team. They can securely pull up your account information and guide you with a fix.
We've updated our support options in QBDT. You can contact us from Monday to Friday, 6:00 AM to 6:00 PM. Then, from 6:00 AM to 3:00 PM every Saturday. Here's how:
In the meantime, I'm adding this article about restoring your company file so you can get back to business in no time: Restore your file. It also contains tips and tricks to successfully execute the process.
Additionally, here's an article to guide you further in getting started with QBDT Pro 2019: QuickBooks Desktop user guides. It includes articles, training, and expert links to familiarize the said program.
Please know that you're always welcome to comment below if you have other concerns or follow-up inquiries about importing company files and managing the growth of your business in QBDT Pro. I'm just around to help. Take care.