Use the switches below to do a silent installation, as follows:

/SP: Disables the “This will install….. Do you wish to Continue?” Prompt at the beginning of the setup and continue with the setup Wizard directly.

/SILENT: This shows the progress bar only to the user, which indicates that installation.

/VERYSILENT: This neither shows the installation wizard or the progress bar and installs the Add-in Silently.

For example:

Setup.exe /SP

Setup.exe /SILENT

Setup.exe /VERYSILENT

Download the updates at http://www.adobe.com/support/connect/downloads-updates.html

For installing Adobe Connect Add-in to the all user profiles, Adobe created yet another program that runs at the startup of the workstation to check and see if the user logging in has Connect already installed. If it's not, this program(scripts) will install the Connect Add-in into the user profile.

Just know that if you do use this "checker" it comes with a old version of Adobe Connect Add-in bundled with it. You need to manually update the "checker" with your desired version of the Adobe Connect Add-in to make this work.

Lastly, this “checker” is not necessary if your Adobe Connect Server is setup properly and you allow users on your network to install extensions in Internet Explorer.

https://blogs.adobe.com/connectsupport/installing-add-in-for-all-user-profiles/