Core class used for handling automatic background updates.
WP_Ajax_Upgrader_Skin
Upgrader Skin for Ajax WordPress upgrades.
Theme_Upgrader
Core class used for upgrading/installing themes.
Theme_Upgrader_Skin
Theme Upgrader Skin for WordPress Theme Upgrades.
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Theme_Installer_Skin
Theme Installer Skin for the WordPress Theme Installer.
Plugin_Upgrader
Core class used for upgrading/installing plugins.
Plugin_Upgrader_Skin
Plugin Upgrader Skin for WordPress Plugin Upgrades.
Plugin_Installer_Skin
Plugin Installer Skin for WordPress Plugin Installer.
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Language_Pack_Upgrader
Core class used for updating/installing language packs (translations) for plugins, themes, and core.
Language_Pack_Upgrader_Skin
Translation Upgrader Skin for WordPress Translation Upgrades.
File_Upload_Upgrader
Core class used for handling file uploads.
Core_Upgrader
Core class used for updating core.
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Bulk_Upgrader_Skin
Generic Bulk Upgrader Skin for WordPress Upgrades.
Bulk_Theme_Upgrader_Skin
Bulk Theme Upgrader Skin for WordPress Theme Upgrades.
Bulk_Plugin_Upgrader_Skin
Bulk Plugin Upgrader Skin for WordPress Plugin Upgrades.
