This page provides download links to the current version of Csound compiled for different platforms. You can also find them on GitHub: https://github.com/csound/csound/releases/latest/
Building Csound from source or from the git develop branch is not very difficult on Linux, and can also be done on Mac and Windows. How-to descriptions can be found in the BUILD.md file included with the Csound sources, also available online: https://github.com/csound/csound/blob/develop/BUILD.md.