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We recommend the automatic upgrade. If you're running version 2.2+, Piwigo will tell you which plugins may be not compatible with Piwigo 2.4 before upgrade.
If you're running Piwigo 2.4.0 you can also download the 2.4.0_to_2.4.1.zip archive that contains all new and modified files. Once you have extracted the files, transfer them onto your web server with a FTP client over your Piwigo 2.4.0 installation. No database upgrade is required.
If you are running a version older than 2.4 and do not want to use the automatic upgrade, then follow the manual upgrade.