I finally had a chance to do this last night and is worked great for me also.
The only thing that threw me off was that the flash directions mentioned are for a Wildfire and not the Trophy.
I downloaded the file VHCTrophy linked to. Then I used instructions from the following (the SparkW is the the Verizon Trophy):
YOU WILL LOSE EVERYTHING!!!
[HOWTO] Use DFT HSPL with Verizon Trophy (SparkW only!) [Revised 7-10-2012] - xda-developers
Specifically this part:
"Make sure your phone is fully charged. Then unplug from the charger/computer and shut it down by holding the top button, and then sliding the screen locker down to the bottom of the screen (yes, I know there are probably a few people that have never shut off this phone to reboot!
Now, hold the vol-down button and press the top power button again. Keep holding vol-down until you get a tri-color boot screen.
Once you see a screen like this, plug your SparkW into your computer. Wait for the "Serial" prompt in the white section to change to "USB." Let "HTC USB Sync" drivers install.
Run "RUU_Spark_W_VERIZON_WWE_1.03.605.20_2K_new_partition" and wait for the files to extract. Once it is done extracting, it should automatically begin flashing the rom. Once the rom is finished flashing, the phone will reboot."
Then all of these updates will load through the Zune software. This will take quite a while to do.