Hi,
I'm trying to create a silent install script for Arduino 1.6.5 but I keep getting the Security popup for the USB Driver, even though I first add both "Arduino LLC" (from arduino.cat) and "Arduino SRL" (from arduino-org.cat) certificates to the LocalMachine TrustedPublisher store, and install the drivers using dpinst.exe as shown by etiennecroteau on this post. But when running the Arduino installer with the /S option afterwards, it keeps given the popup for the "USB Driver" for trusting "Arduino SRL". Although, no popup comes up for the other drivers signed with the "Arduino LLC" certificate.
This is on Windows 7 x64.