This is 'techy stuff'. 

Ask your IT people to do this or if you want us to, there is a charge.

To setup a policy that (almost) automatically installs Direct CONTROL for a user that has not logged on at that machine before, do so through group policy under client policy/computer configuration/Administrativetemplates/system/logon- Run these programs at user logon and add the directcontrol.application.

It will still prompt for install but all the user needs to do is click that.

Automating the Installation of Direct CONTROL for each user

The question was also asked if there was a 'silent switch'. Please see the following article for information regarding this:

ClickOnce and Silent mode installation (microsoft.com)

You can try the /i /s flags, but this will not remove the box for the user to be prompted if they trust the application source.

It will remove the prompts for upgrades too and just apply them automatically when it loads.