I have a TomTom 930T with navigation software version 8.302.
I downloaded TripMaster from the webpage, and unzipped it. I copied the folders directly into the root directory of the TomTom drive letter, when it was connected to the computer, without using TomTom HOME at all (it wasn't even open at the time).
On the TomTom's main menu, now I have a "TripMaster v2.0" icon.
Unfortunately, when I tap that icon, the screen just goes black for about 2 seconds. Then, it immediately flips back to the TomTom's main navigation screen. TripMaster doesn't seem to be coming up at all.
It doesn't crash the TomTom or cause it to reboot, which is good, but it doesn't do anything useful at all, either. It just gives me about 2 seconds of black screen, then it's back to the normal TomTom interface.
Rats, I was really looking forward to getting a working altitude readout on the TomTom!