Theme Installer Skin for the WordPress Theme Installer.

Action to perform following a single theme install.

Action to perform before installing a theme.

Core class used for upgrading/installing themes.

Turn off maintenance mode after upgrading the active theme.

Turn on maintenance mode before attempting to upgrade the active theme.

Delete the old theme during an upgrade.

Install a theme package.

Initialize the installation strings.

Get the WP_Theme object for a theme.