You will need to download ProSeries for each tax year that you want on the new computer. I put 2011-2019 on my newest computer. My staff's computer got 2015-2019.

All files will need to be "restored" into the ProSeries program on the new computer.

Copy the data files from each tax year from the original computer to a USB thumb drive (if not on a network). Save them to a folder labeled by year. example:  2018 data should be in the folder- c:\ProWin18\18Data. Save it to the thumb driver in a folder named 2018.

In your new computer, open 2018 ProSeries.

Go to: File>Client File Maintenance>Restore

Find your USB drive and the folder that you saved the files into.

Select All and restore.

I also copy and replace both the COMMON and HOMEBASE folders from the old computer to my new computer, this brings over all kinds of things like Employer Database and EFile Acknowledgments.