As of July 2015, the VCFtools project has been moved to github! Please visit the new website here: vcftools.github.io/downloads.html
Downloading through Sourceforge
There are two ways to download VCFtools.
The stable releases can be downloaded from the project Sourceforge page here:
https://sourceforge.net/projects/vcftools/files/
Downloading with Subversion
The latest developmental version can be downloaded through the subversion client. If subversion is installed, run the following command:
svn checkout http://svn.code.sf.net/p/vcftools/code/trunk/ vcftools
The above command is required to be run only once, for any subsequent updates run the following command from the vcftools directory:
svn update