I downloaded the two qually files and warm up with no issues. However downloading the race in fact 4 complete times for all 5 parts but the result was the same, after unzipping and playing it stops at around 4.5 mins and goes back to the start. I tried formatting it to AVI and MP4 with the same results. Even burnt it onto a DVD. After playing with Factory Format I did manage to run from 5mins to lap 14 after that it just stops. have tried in 5 different players and three different computers using a variety of playback apps. All encountered an issue.
No idea what to try next.