Add the generic strings to WP_Upgrader::$strings.
WP_Upgrader::fs_connect
Connect to the filesystem.
WP_Upgrader::download_package
Download a package.
WP_Upgrader::unpack_package
Unpack a compressed package file.
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WP_Upgrader::install_package
Install a package.
WP_Upgrader::run
Run an upgrade/installation.
WP_Upgrader::maintenance_mode
Toggle maintenance mode for the site.
Theme_Upgrader::theme_info
Get the WP_Theme object for a theme.
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Theme_Upgrader::install
Install a theme package.
Theme_Upgrader::upgrade
Upgrade a theme.
Theme_Upgrader::current_before
Turn on maintenance mode before attempting to upgrade the current theme.
Theme_Upgrader::current_after
Turn off maintenance mode after upgrading the current theme.
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Theme_Upgrader::delete_old_theme
Delete the old theme during an upgrade.
Theme_Installer_Skin::before
Action to perform before installing a theme.
Theme_Installer_Skin::after
Action to perform following a single theme install.