Have you provided the credentials as requested? When creating the cluster you should be prompted for the IP address of the cluster member you want to add, the admin user name and password. Once you have entered these credentials, if it warns you that the framework will be updated I would still continue. It does seem odd that three new installs based on the same version would generate this message but if they are the same version I would be surprised to see an actual update occur. Continue though and post an update if there are issues.