Firebird V1.5.4 has been released as is available for download
at:
http://www.firebirdsql.org/index.php?op=files&id=engine_154
or:
http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_download_15

Please note that it is possible that not all of the mirrors on
Sourceforge have been populated.

Regards
Paul Beach
Tel (France): +33 (0) 2 47 58 30 43
Mob (France): +33 (0) 6 79 24 32 32