No, installation doesn't delete FTP locations. FTP locations are stored in PSPadFTP.INI file. This file is located in depends of Program settings / System / [x]Multiuser environment in PSPad folder or in \%userprofile%\Application data\PSPad folder
I guess you change this option during installation -- <http://forum.pspad.com/read.php?2,50809,50812> PSPad freeware editor http://www.pspad.com
