What are you referring to with “USB dongle Quick Start”. i am not sure where you get it from and what it does contain but Developer Studio is an IDE you can download and install from the link you stated. I will let maybe SierraW Engineers to comment on the USB dongle Quick Start.
All LEGATO developers attending “Sierra Wireless Developer day” last june got a " USB dongle quick start" including all Legato set up but “Developer studio” is not included in the dongle so we need to install it from the link above.
The USB dongle did include developer studio as well. There should actually be a link to it on the desktop when you boot from the USB stick. However, these were all made by hand the week before the event so there is a chance there was a mistake with one. Can you double-check to make sure it definitely isn’t there? I don’t have a stick here right now to refer to, but I’m pretty sure it’s under the home directory somewhere.
I have a Legato USB stick (not from the dev day conference) and it has a ‘Link to Dev Studio’ installed on it so you should be able to down load it since it is not pre installed.