In any case - trial version or registered version - you must use the installer to create the new "EpsonShare 1.2" folder on the startup disk of your Mac printing server.
If you previously installed an earlier beta version of EpsonShare, quit "EpsonShareServer" and all "EpsonShareClient", unshare the old shared folder <yourPrinter@yourName> or <yourPrinter@yourComputerName> and move it to the Trash, a new folder will be created by EpsonShareServer.
If you previously installed an earlier 1.0, 1.1 or 1.1.1 version of EpsonShare, quit "EpsonShareServer" and all "EpsonShareClient" and replace these applications by the new 1.2 versions.
The documentation, updated for this 1.2 version, is under HTML format, open the "Documentation.htm" file with Netscape or - lack of anything better - with Internet Explorer.