The current ADMIXTURE version is 1.23.

ADMIXTURE binaries

Linux x86[_64]:         admixture_linux-1.23.tar.gz (requires kernel 2.6.18 or higher)
MacOS X x86[_64]:   admixture_macosx-1.23.tar.gz

ADMIXTURE documentation

admixture-manual.pdf

Sample data files

Here is a zipped archive containing all of the data files for the HapMap3 dataset that we described in our paper: hapmap3-files.tar.gz