You can't change the subscription LiveID used for an installation that has been activated. You can uninstall and reinstall and then activate with another LiveID. Verify that the LiveID has a subscription by signing in at http://billing.microsoft.com
Once all of your PCs are at v2, you should be able to see what subscription each is on as you can put them into a Circle and promote one or more to be a Hub, monitoring the other PCs.
-steve