hi matab,
yes you are finished with replacing all files. there is nothing more to do..
BUT remember.... all added mods and changes in your php files and templates will be lost...but you will be UP2DATE
description of OLD update php files (DO NOT UPLOAD and EXECUTE THEM if you have version 1.7 or newer!):
update_1.0_to_1.5.php
this file is for execute to be up2date for 1.5 if you are running 4images 1.0
update_1.5_to_1.6.php
this file is for execute to be up2date for 1.6 if you are running 4images 1.5
update_1.6.1_to_1.7.php
this file is for execute to be up2date for 1.7 if you are running 4images 1.6.1
and so on...
since 4images version 1.7 there are no update scripts, only files replacements.
hope this is clear now