This seems like a model case for why we need better sustainable bioinformatics data and services. I don't know the exact background behind this, but some things are obvious:
The original author (Horvath) no longer works for the institution (UCLA) where the project was developed,
He's now working for a private company (Altos) founded by Jeff Bezos
After he left, someone (possibly UCLA) deleted his group's web-space and is unable or unwilling to bring it back
Ratz: The important documentation is essentially lost (note the package is still available via the package manager)