OSCAR-6.0.x does not involve any manual downloading, everything is managed via binary packages. Therefore, this download page only concern OSCAR-5.x and prior release
For old releases, please check out our SourceForge Project Filelist Page.
OSCAR 5.1 beta2 has been tagged and the OSCAR 5.1 b2 tarballs for all the supported distros are available here now.
Please give it a try and let us know if you have any problems.
Nightly snapshots are available here.
To build OSCAR from SVN, check SVN instructions.
Package repositories are available. See there for including their address in your preferred package management tool.