The OF4.5.zip file you have requested: Modifications / Open Falcon 4.5 OCI - 736.53mb is not available. Perhaps try browsing all files for the game Falcon 4.0 and upload any files you want to share or are missing. This is the only information we could locate:
A stand-alone installer of Open Falcon v4.5 modification for the original Falcon 4.0 combat flight simulator. This mod doesn't require any patches prior to its installation, a fresh install from Falcon 4.0 CD is enough. Open Falcon is considered as t One-click-installer of Open Falcon 4.5. Original Falcon 4.0 install required.