The latest release can be downloaded from the SourceForge file releases page. Get the file for the appropriate platform (Linux, Mac, OpenVMS, or Windows). Extract the compressed package and copy it to a work folder. The OpenVMS and Windows packages contain compiled binaries. Other platform will need to compile the source code. Makefiles are included for the most popular compilers. Follow the install instructions for the appropriate platform as described in the Install Information documentation.
The latest development source is in the Artistic Style repository at SourceForge. The repository address is "https://astyle.svn.sourceforge.net/svnroot/astyle". The current version is in the "trunk/AStyle" branch of the repository. The file and directory names in the repository are case sensitive.
A sample checkout is:
svn checkout "https://astyle.svn.sourceforge.net/svnroot/astyle/trunk/AStyle"
"$HOME/astyle"
You can also browse the subversion repository. This gives you a view into the current status of the project's code without actually checking-out the files.