Hi there, 1dayit.

Welcome to the QuickBooks Community. I'll be providing details on how QuickBooks updates to the latest release work. Then, ensure you'll be familiar with how the program helps you fix unexpected issues you might encounter.

QuickBooks Desktop has the option to update the program automatically or manually. With this, QuickBooks downloads or installs the latest updates when they're available and depending on the type of patch or release you have. 

Since you've just updated to R5_45, you're unable to roll back from R3. This is because we update QuickBooks regularly to give you a better experience and fix issues. You can click this article for further details and see what’s new and improved in the latest updates to QuickBooks Desktop 2022: Release notes for QuickBooks Desktop 2022.

Lastly, I'm adding this article to view different details to guide you in effectively working your business using QBO: Help guide for QuickBooks Desktop. It includes topics about banking, customer and vendor transactions including payments.

Please don't hesitate to click the Reply button below if you have other concerns about QuickBooks updates. I'm always here to help you anytime, 1dayit. Take care and keep safe!