You can easily import old or existing in current or upgraded versions.
Go to "File" and choose "Import..." A Window will appear, where all of your keychains, saved in the default storage location, are displayed. (usually *.esf files, older version have the format *.sef)
The files are located by default at:
C:\Documents and Settings\%USERNAME%\Application data\Steganos (Windows XP and earlier)
C:\Users\%USERNAME%\AppData\Roaming\Steganos\ (Windows VISTA/ Windows 7/ Windows 8)
If you don´t find the folders, make sure to enable the Windows option "show hidden files and folders" ( http://windows.microsoft.com/de-de/windows-vista/show-hidden-files ).
Choose your file and confirm. Your keychain should be now imported.
Please remember: only keychain from version 5 and above can be imported in newer versions.