I think there are some "legalities" there that could be argued.
Granted, you're only buying a "License" to use, but I don't think
they can "rescind" that License and make you buy "the new ones".
I'd be doing some heavy "License" research...but, chances are, they slipped
in a "change" of the License Agreement somewhere along the road and had
everyone agree to it unbeknownst....that's how companies (and Governments)
do things these days...