Documentation - Upgrade
If you want to upgrade your older script version to a new one, you don't need to install the gallery from scratch. It should be sufficient to replace all files inside the ki_base-folder and the ki_include.php.
This way all pictures, thumbs, picture comments and viewer comments stay in place and don't get lost.
Upgrade from version v3.2 or less to v3.2 or greater
If you upgrade from a script version less than v3.2 you need to edit your setup-files manually. Add a prefix ki_ ($fr_width -> $ki_fr_width) to every parameter. If you don't edit your files all settings will be replaced with default values.