I have received a sizeable number of reports from people trying to upgrade to version 3.2.0 from WordPress facing issues claiming that the automatic upgrade reports some files missing. The reason for this is sometimes the download file gets corrupted. I have faced this problem a few times in the past, with version 2.4.9, 3.1.9 and now 3.2.0. There is nothing wrong with the theme itself, but for some reason the download doesn’t work for some people. To cite an example I could do a smooth upgrade on 2 of my sites, but on the third site I faced the problem myself.
Anyway, if you face problems, please see this thread on the support forum. I have provided the right file to download over there along with instructions.