From an email from the developers:

XCSoar 5.0 Stable has been released!

This is a major breakthrough and a very exciting release.
Improvements have been made in the features, stability,
performance,
usability, manual, language interfaces, configurability
and more.
XCSoar has gone though thorough testing and has a team
of developers,
users and testers working on it on a daily basis.

See:

http://www.xcsoar.org/mediawiki/index.php/Install
- for Installation notes

http://www.xcsoar.org/mediawiki/index.php/Download
- for Downloads
http://www.xcsoar.org/mediawiki/inde...load/Version50
- for Changes

http://prdownloads.sourceforge.net/x...manual-500.pdf
- Download the manual