The source for 1.2.4.1 doesn't seem to be available anywhere. The source for 1.2.4 can only be obtained through svn.
svn checkout
https://forja.rediris.es/svn/csl-subdownload
(in
https://forja.rediris.es/scm/?group_id=161 )
Theoretically it should be possible to download the latest tarball in this link, but in reality it doesn't work:
https://forja.rediris.es/tarballs.php?group_id=161
I made a tarball for people that can't or won't use svn. The link should be in the MacOSX thread (sticky in this same forum topic).
In my version I had to delete some lines that tried to do locale searches (unsuccessfully for me).
I was hoping to take a look at it to actually obey my settings and not show me subtitles for languages I don't desire and also to see if I can devise a command-line mode I could later adapt into a contextual menu or cronjob.
And no, 1.2.3 doesn't work nice at all. 1.2.4 is much better, although there is still work to be done.