I can share some information about updating to the latest version of QuickBooks Desktop, @yosanlibrary.

You'll have to purchase a license to install and upgrade to QuickBooks Desktop 2020. To know our latest version of QuickBooks and its latest features and how much it cost, check this link: https://quickbooks.intuit.com/desktop/. 

Please make sure that your computer meets the system requirements for QuickBooks Desktop 2020 and Enterprise Solutions 20.0 to run the best QuickBooks Desktop experience.

You can reach to our Customer Support to get QuickBooks Desktop 2020. From here, they can help you install and activate your QBDT.

See this contact QuickBooks Desktop support article for more information. Here's also a guide on how to install QuickBooks Desktop. 

I'm always here if you still have questions about updating to the latest version of QuickBooks Desktop. Keep safe and have a wonderful day!