The process will take 5–10 minutes. When finished, you will have a folder named vuplus on your USB stick.
Verdict (concise)
For the Solo2, these are the most stable builds currently being maintained. You will need to unzip these before flashing.
The box shows "Starting..." but never flashes. Solution: Your USB drive is incompatible. Try a 2GB or 4GB drive. Also, rename the folder to uppercase VUPLUS and SOLO2 if needed.