7.3.0.40 installation doesnt work?

Hi all!
Yesterday I was very glad to
find a new build of 7.3.0.40,
and see (in the realease info)
that so many bugs related
to joins were fixed.
So - I have downloaded this,
unzipped and try to upgrade my
7.3.0.34 server (on my Windows XP),
but the installation
doesn't even begin properly.
It exits with the runtime error saying
that sdbrun.dll library could be loaded.
And in fact there is no such file in the installation folder.
Could someone give me any hint?

Best regards,

Marcin Pytel