Install new version over existing (you can Copy and backup existing installation and simply copy it back).
All main settings is stored in the PSPad.INI file. It's location depends of the Program settings / System / Multiuser environment. If unchecked, it lays in the PSPad folder, if checked, it is placed in the %userprofile%\Application data\PSPad folder -- <http://forum.pspad.com/read.php?2,40839,40922> PSPad freeware editor http://www.pspad.com
