Call support. They have articles to provide. (I have a similar question and I just called them.)
https://proconnect.intuit.com/support/en-us/help-article/convert-files/proseries-backup-instructions...
https://digitalasset.intuit.com/DOCUMENT/A8BCxi2xK/ProSeries_to_Lacerte.pdf
https://proconnect.intuit.com/lacerte/data-conversion/
