how to update a non-official app/repo

[Spyros Tsiolis]

Hello again,

I have hylafax installed on a server and "yet-another-java-hyla-fax-client"
(YAJHFC) on the clients.

It used to work fine for about two years.
The other day, it stopped working.

I suspect a java upgrade from the official repos.
Anywhoo, the main thing is that it's not working anymore 
(something about a named pipe not existing anymore).

The question is this; How do I proceed with it ?
Do I try an "apt-get update" ? Do I get rid of the old
version and try installing the new one ?

Clients are ubuntu 12.04 x86.
Fax server is an ubuntu 12.04 x86

Thank you again for your time ,

s.