Upgrading farms theme pack


I've got the Farms theme pack installed on my networked site and it's showing that all themes, (133), require updating.

When I've clicked on the update link it's taken me to the Farm Themes Pack page so I've downloaded it, then uploaded the new version via FTP and done a network updat but it's still showing the themes require updating.

Are there any specific instructions for updating the Farms Theme pack on a networked site you cam point me in the direction of please? I can't find any.