Watch the links they may wrap.

Updated Release Notes
http://www.firebirdsql.org/download/prerelease/Firebird_v2Alpha02.ReleaseNotes_0200_20.zip

Windows

Official Windows Setup and Installer For Classic and SuperServer 2.0 Alpha (.exe) (3.0mb)
http://firebird.sourceforge.net/download/prerelease/win32/Firebird-2.0.0.10834-0-Win32.exe
SuperServer and Classic for Windows 2.0 Alpha (.zip) (3.8mb)
http://firebird.sourceforge.net/download/prerelease/win32/Firebird-2.0.0.10834-0_win32.zip
Embedded Server for Windows 2.0 Alpha (.zip) (2.0mb)
http://firebird.sourceforge.net/download/prerelease/win32/Firebird-2.0.0.10834-0_embed_win32.zip
Windows Debug Build 2.0 Alpha (.exe) (5.1mb)
http://firebird.sourceforge.net/download/prerelease/win32/Firebird-2.0.0.10834-0-Win32_pdb.exe
Windows Debug Build 2.0 Alpha (.zip) (8.0mb)
http://firebird.sourceforge.net/download/prerelease/win32/Firebird-2.0.0.10834-0_win32_pdb.zip
Embedded Server Debug Build for Windows</A> 2.0 Alpha (.zip) (3.9mb)
http://firebird.sourceforge.net/download/prerelease/win32/Firebird-2.0.0.10834-0_embed_win32_pdb.zip

Linux
Classic for Linux 2.0 Alpha (.rpm) (3.0mb)
http://firebird.sourceforge.net/download/prerelease/linux-x86/FirebirdCS-2.0.0.10833-Alpha2.i686.rpm
Classic for Linux 2.0 Alpha (.tar.gz) (2.9mb)
http://firebird.sourceforge.net/download/prerelease/linux-x86/FirebirdCS-2.0.0.10833-Alpha2.i686.tar.gz
Classic Debug Build for Linux 2.0 Alpha (.tar.gz) (19.1mb)
http://firebird.sourceforge.net/download/prerelease/linux-x86/FirebirdCS-debuginfo-2.0.0.10833-Alpha2.i686.tar.gz

Linux NPTL
SuperServer for Linux NPTL 2.0 Alpha (.rpm) (3.0mb)
http://firebird.sourceforge.net/download/prerelease/linux-x86-nptl/FirebirdSS-2.0.0.10833-Alpha2.nptl.i686.rpm
SuperServer for Linux NPTL 2.0 Alpha (.tar.gz) (3.0mb)
http://firebird.sourceforge.net/download/prerelease/linux-x86-nptl/FirebirdSS-2.0.0.10833-Alpha2.nptl.i686.tar.gz
SuperServer Debug Build for Linux NPTL 2.0 Alpha (.tar.gz) (18.5mb)
http://firebird.sourceforge.net/download/prerelease/linux-x86-nptl/FirebirdSS-debuginfo-2.0.0.10833-Alpha2.nptl.i686.tar.gz

Regards
Firebird Project