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)
1)Save the file to your hard disk.
3) Run to install it. All default options are OK
4) Reboot your PC. After rebooting your PC, install Versus.
If the above download does not work, here is a few direct links for downloading FireBird:
They are not tested yet.
DO NOT DOWNLOAD THE 64BIT VERSION: VERSUS IS NOT CAMPATABLE WITH 64 BIT.