And another quick feedback:

I pulled down the Windows version and the install went smooth as silk on a
non-fresh server (which has been running RC1, RC2 and waiting for this
software for a while!).
The install program detected the version running ask asked for stopping the
service. All ok.
Guardian running, server running, everything seems to be where it should be.

Congratulations to the Firebird development team!

Artur