1. We copy the mod_upgrade.php for auto upgrade and then after auto upgrade we revert the original file orig_upgrade.php
// Softaculous Change
define(PHPWG_IN_UPGRADE, true);
2. Change the $dbver in upgrade.php it is the value from database config table `piwigo_db_version` row
3.Please remove 'derivatives' and 'elegant' entries from [[dbprefix]]config table (i.e below the 'data_dir_checked' entry),as they are made automatically(since version 2.8.6).
4.PHP REQUIREMENT LINK : https://piwigo.org/guides/install/requirements (12.x.x onwards requires php 7.0))
5. Delete entry from `[[dbprefix]]activity` table as it creates after login.
6. Post login in manual installation, Enable all the languages from "configuration --> Languages" take a dump of a SQL and update our languages table and install.xml file accordingly.
7. Take sql dump when installation is completed.
8. Uncheck  'Subscribe ad to Piwigo Announcements Newsletter' option while manual installation.
9. `[[dbprefix]]user_cache` entry is created post visiting gallery (Remove entry if present).