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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 13 before upgrade.
If you're running Piwigo 13.x you can also download the 13.x_to_13.8.0.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 13.x installation. No database upgrade is required.
If you are running a version older than 13 and do not want to use the automatic upgrade, then follow the manual upgrade.