Files can be downloaded from the SourceForge files page.
Before downloading, please read the license. It’s short, really. You may also want to read the requirements.
If you are feeling adventurous and can't wait for updates then feel free to try a nightly build, but you are doing so at your own risk. These versions contain work-in-progress code.
No source is provided for nightlies since it is not necessarily in a state suitable for public consumprion, ask by e-mail if you want a copy.