You can download HSLayers either from ziped archive or from SVN directly.
Trunk version (NOTE: Currently broken, due to migration to ExtJS 4)
Development branch:
svn co svn://bnhelp.cz/hslayers/branches/hslayers-3.4
Previous stable branch
svn co svn://bnhelp.cz/hslayers/branches/hslayers-3.3
For more downloads, go to Redmine Files section
You can also browser the code directly