[Genome] Downloadable files for placental-mammal-only conservation scores?

[Xiaoyu Chen]

Hi,

I am a PhD student at Univ of Washington. I was trying to download
the placental-mammal-only conservation scores for hg17 & hg18. I found the 
"placental-mammal" option at the webpage:
http://genome.ucsc.edu/cgi-bin/hgTrackUi?hgsid=103139974&c=chrX&g=multiz28way
But I couldn't find the downloadable files. Could you please let me know 
where I can download such files?

Thank you very much!

xiaoyu Chen