Unable to update Plug-ins

Just happened to be reading up on the aTV website and found there were updates for the silver aTV so I thought I would check it out after a year or so of not doing much with it till now. I did as shown and went to the Manage Plugins and sure enough I found four Updates. They are Maintenance, nitiTV, Sapphire and XBMC.  When I click on any of them it starts to download and after 1-5 seconds I get "An error occurred" message. 

How can I get it to update?