on sourceforge.net, the Release Candidate 5 has the 2.0.0.12745-1 version,
but i downloaded earlier today a 2.0.0.12748-0 version.
is this the final version or some kind of "Release Candidate 6" ?

from the changelog:

**************************
* v2.0 Final
**************************

* Fixed RC5 bug (CORE-980)
NO WAIT is implied instead of WAIT when the host application
doesn't provide TPB
Contributor(s):
Dmitry Yemanov <yemanov at yandex.ru>

* Fixed RC5 bug
Server crashes if being connected via gds32 from latest
InterBase versions
Contributor(s):
Dmitry Yemanov <yemanov at yandex.ru>
Alex Peshkov <peshkoff at mail.ru>

**************************
* v2.0 Release Candidate 5
**************************

* Fixed unregistered bug
Win32 installer was trying to upgrade an existing Fb 1.5 install.
This was the underlying cause of CORE-934
Contributor(s):
Paul Reeves <preeves at ibphoenix.com>
................................