Interní Embeded Firebird je 32 bit
Testován plný Firebird verze 4 64 bit, ale fungovat by mělo i s 32 bit 

https://github.com/FirebirdSQL/firebird/releases

Instalace EXE
https://github.com/FirebirdSQL/firebird/releases/download/v4.0.2/Firebird-4.0.2.2816-0-x64.exe

Soubory ZIP
https://github.com/FirebirdSQL/firebird/releases/download/v4.0.2/Firebird-4.0.2.2816-0-x64.zip