The recommended version is always the last tag in the SVN. Thus you can use the following command:
svn co --username anonsvn https://fusionforge.zih.tu-dresden.de/svn/hicfd/tags/Scout_1_6_0 Scout
The password is "anonsvn". Read "INSTALL.TXT" for the installation process.
However you should check whether there is already a newer tag available, since it will be updated more frequently than this website. Alternatively you can checkout the trunk using the following command:
svn co --username anonsvn https://fusionforge.zih.tu-dresden.de/svn/hicfd/trunk/Scout Scout
Of course working on the trunk is on your on risk.