No, you don't need to have an older version installed.
• Should I uninstall my older Version of Legacy first?
No, you don't need to uninstall an earlier version first. You can if you want to but it isn't required.
• What will happen to my family files?
Your family file will not be erased by installing a newer version of the program.
• Will Legacy 8.0 overwrite my old Legacy program?
No, Legacy Family Tree 8.0 will not overwrite or replace earlier editions.
When installing Legacy 8.0 only some of your customized settings from earlier versions will be retained. Any of the font and color settings from earlier versions will need to be re-set if you want your own look and feel.