The latest version of ownCloud client can be obtained at http://owncloud.org/sync-clients/.
ownCloud client for Windows is provided as a NSIS-based setup file for machine-wide install.
Installing the ownCloud client on your Mac follows the normal app installation pattern:
The ownCloud client is provided as in a convenient repository for a wide range of popular Linux distributions. If you want to build the sources instead.
Supported distributions are CentOS/RHEL, Fedora, SLES, openSUSE, Ubuntu and Debian.
To support other distributions, a source build is required.