Lyx 1.5.2 binaries for Ubuntu

[Fritz Bein]

Hi all,

I am looking for Lyx 1.5.2 binaries for Ubuntu. In the directory  
ftp://ftp.lyx.org/pub/lyx/bin/1.5.2/, the Debian files are not  
downloadable.

Does anybody has an idea why this can be, or knows another source?

Thanks for your help,
Fritz