No need to install it if it is installed already.
Current suggested version: 2.5.2
If Interbase is installed: uninstall and remove it.
If you have a previous version of Firebird running on our PC,
first, stop and uninstall it (from the “Control Panel”).
Download 32-bit. (7.0Meg)
DO NOT DOWNLOAD THE 64BIT VERSION: VERSUS IS NOT COMPATIBLE WITH 64 BIT.