Gail,

Yes, DataFlex revisions can coexist on the same system.

If you downloaded DataFlex Personal, you should have been prompted to fill out some information and then will receive an e-mail with your license. In the meantime, 19.1 will run in eval mode. Once you get your license information, you can go to Register DataFlex on the Start Menu, or use License Registration on the Help menu in the Studio.