Hi there,

these two tracks are the same, except for their polycount and their loading time. 

for those unexperience with manual track installment;

In order to race them, open up your data/races.txt and change the name of any race to downtown_vice.txt

extract the highpoly track zip into your races folder and start up your c2.exe. When you've tested the highpoly track, extract the lowpoly
files to the same directory, overwrite and test the track again please. Notice any difference?

have fun!!!

Harmalarm