Select here to dowload the current 5.3.4 revision, released September 26, 2019. Version 5.3, released October 26 2018, is a "feature" version, and has not undergone full validation. This is the last of the release series, as the version 5.3 branch has been retired wih the release of (stable) version 6.0.
As with any version, in case you detect bugs, we appreciate your feedback on the forum and bug-tracker, which will help us to provide you with patch releases for this stable series, as well as improvements for future development versions. Reminder: current Code_Saturne development cycles are based on a release approximately every 6 months, including a fully validated, "long-term support" version every 2 years. For more details, the reader may refer either to the release notes of the version or to the NEWS.md file. For those interested in a Windows build, please read this.
Salome_CFD binary builds containing Code_Saturne 5.3 are also be available on the following page: http://www.salome-platform.org/contributions/copy_of_combs and on the SALOME_CFD section of this site.