Upgrader Skin for Automatic WordPress Upgrades.

Stores a message about the upgrade.

Retrieves the buffered content, deletes the buffer, and processes the output.

Retrieves the upgrade messages.

Creates a new output buffer.

Determines whether the upgrader needs FTP/SSH details in order to connect to the filesystem.

Compare the disk file checksums against the expected checksums.

Determines if this WordPress Core version should update to an offered version or not.

Core class used for updating/installing language packs (translations) for plugins, themes, and core.

Asynchronously upgrades language packs after other upgrades have been made.