Rule number one:     you should have kept a copy of the installer.
Rule number two:     you should have upgraded as they released new
            versions. For future compatibility.

That said if you can provide an e-mail address which will accept a
5*1.333 ~ 7MB attachment I can mail you a copy of 2005v1.12 or 1.13 or
2006v1.20. Note you can no longer register it, so you'll get the
registration nag screen unless you modify the appropriate registry
entries in Windoze. There is however a tool someone has built to do
this for you out there.