I have to admit that I have never actually tried that! That seems strange though. Surely, you can download it just by hitting 'check for updates' in the mainn part of HOME though, right?
No it doesn't work.
I loaded up my OEM SD card and connected to my computer. As soon as HOME came up I got the prompt for downloading the QuickGPSFix, I cancelled it.
I then went through HOME to open VTT, then Main Menu>TomTom PLUS services>Check for updates. I get a message that the software is up to date.
I again went to Main Menu>TomTom PLUS services>Download more and the option 'Disable Auto QuickGPSFix' is greyed out meaning it is enabled.