Admin - Configuration - My Store - Show Version Update In Header - Admin

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Menu: Admin - Configuration - My Store - Show Version Update In Header - Admin

/path/to/your/shop/admin/includes/header.php

Line #116 : if ((SHOW_VERSION_UPDATE_IN_HEADER == 'true' && $version_from_ini !='off' && ($version_check_sysinfo==true || $version_check_index==true) && $zv_db_patch_ok == true) || $version_check_requested==true ) {