To upgrade your installed version of Penny Lane Retail Enterprise to a new version follow these steps :
Rename your existing Penny Lane Retail Enterprise directory from \plre ( ie. the default ) to \plreback .
Install your new version into the default directory ( \plre ).
Copy the \poll directory which exists below the \plreback directory into the \plre directory, replacing the existing \plre\poll directory.
Copy the \term1 directory which exists below the \plreback into the \plre directory ( replacing the existing directory ).
Copy your customized configuration files from \plreback\mgr1 into \plre\mgr1. These files are printers.dat, termtag.dat, and terminal.sys.
Copy your customized configuration files from \plreback\data into \plre\data. These files are : storetag.dat, appltag.dat, and keytag.dat.
Copy over any databases you wish to save from the old system. This involved copying the .DEF and the .DBF files from the \plreback\data directory into the \plre\data directory. For example, if you wish to bring back the PLU database you must copy over plu.def and plu.dbf. Other possible databases include can be found below :
Perform a File Repair on each database you transferred over in Step #6. The File Repair utility is accessed through Setup / Data Utilities / File Repair Utility.