There are many ways to upgrade when each computer has the binaries loaded locally.
You definitely should get off of 3.x version.
See the posts in http://www.kixtart.org/board/ultimatebb.php?ubb=get_topic;f=2;t=003344#000000
for some ideas. I believe the FAQ forum also some ideas as well MCA's web site.
I check for the proper verion each and every logon and can uipgrade all client anytime. My web site also has some logon script design thoughts.
