All Supernodes communicates with Kazaas servers. In this way Kazaa can remote control all the supernodes and so force the clients to upgrade, lock some older versions out or wake up the altnet from Brilliant Digital. They can probably do more worse things with the PCs of users which are connecteted to Fasttrack.
So Fasttracks servers give the order to supernodes to do something. The reason for the upgrade to version 1.5 is probably only to distinct between desired and undesired clients.
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