Hello there, Lori B.
Thank you for posting here in the Community. Allow me to provide additional information about QuickBooks Desktop 2019.
Since the Round Tripping process requires the same version of QuickBooks Desktop for Mac and Windows, you can download our 30-day free trial of the program.
For more information about how you can download the trial version, I'm adding the article that I recommend:
Please keep in touch with me here should you have any additional questions or concerns. I want to make sure you're taken care of.