The zips contain setup.exe files that will install the models onto your computer. The default path is FS2002, as the plane was designed for FS8, but works fine in FS9 also.
I'd agree with Relentless - the Posky 747 V4 model is good - make sure you download the FDE update from the Posky site also.
Speaking of Posky, I understand that they are about to release a 777-200...
