You should only have one database upgrade to do if all your client are connected to same database. I sure you can find a SQL Server script in google to disconnect all the users.
For the other request about the version, you can specify a minimal version of RDM and restrict access to those who has not upgraded:
http://help.remotedesktopmanager.com/tipsandtricks_team.htm
For the other request about the version, you can specify a minimal version of RDM and restrict access to those who has not upgraded:
http://help.remotedesktopmanager.com/tipsandtricks_team.htm