Why ver.1.2.1 work correct on my server but 1.4.14 not?
[b]3.1.2 Upgrading from cpg1.1.x, cpg1.2.x or cpg1.3.x to version cpg1.4.x[/b]
First, make a backup (dump) of your database.
Backup your include/config.inc.php file, your anycontent.php file and your "albums" directory.
Unpack the archive
Except for the "albums" directory, upload all of the new files and directories making sure not to overwrite the include/config.inc.php file, your anycontent.php file or the albums directory.
Delete all leftover, outdated language files in the lang folder
If you have not already done so, create a folder called "edit" within your "albums" directory - this folder will be used by coppermine as a temporary folder, do not ftp-upload files there. Make sure the new "edit"-folder is CHMODed the same way your albums-directory is (755 or 777, depending on your server's config)
Run the file "update.php" in the coppermine directory once in your browser (e.g. http://yourdomain.tld/coppermine/update.php). This will update your coppermine install by making all necessary changes in the database.
If you have made a custom theme, apply the changes that were introduced in the themes structure to your custom-made theme - refer to the theme-upgrade guide.
You can not use language files from older versions of Coppermine as primary language (the language the admin will use) - make sure you only have the language files that come with this package inside of your lang folder (delete or rename all files from older versions within the lang folder).
If you need to use a language that hasn't been translated for cpg1.4.x, you can try using the language file from cpg1.3.x, however there are certain caveats:
nothing about cyrillic-1251 and utf8
may i upgrading my Gallery correctly?