I worked with Open Dental software also, on their software there is an option allow admin user to turn off software update from the workstations. Update only can be done on server only. Because, if the users able to run Dentrix update from the workstation will cause a major headache for I.T. and Dentrix tech support. I noticed Dentrix has an option to suspend check for update to 1 month, but it still allows users to change the option.