Does Cubase LE AI 6 support for upgrade?

Can I upgrade Cubase LE AI 6 to Cubase 6 or Upgrade to Cubase 7 in an future?
If I can that which upgrade method or can I buy upgrade disc for upgrade my Cubase LE AI 6? and can it run internet support for upgrade by online?

Thank you, looking forward to the news.

Jeff

http://www.steinberg.net/en/shop/buy_product/product/cubase-6.html
Here, there is an upgrade from Cubase 4 or 5 LE/AI. Doesn’t say anything about Cubase 6 LE/AI.
It seems logical that if you can upgrade from 4 or 5 LE/AI you should also be able to upgrade from 6 LE/AI.
I recommend e-mailing Steinberg.
HTH
J.L.