It is nothing more-nor-less than a one-month trial license for Prepar3D. Prepar3D is a commercial version of ESP1 (which itself was pretty much FSX+SP2).
It is intended to introduce new folks to Prepar3D. As previously described, Prepar3D is primarily aimed an what is known as "Serious Simulations," that is to serve as the base platform for commercial flight training, military battlefield simulations, underseas exploration, et cetera. It also is being used as the engine for hardware solutions, such as those built by Redbird, and others.
Aside from the $499 "seat license" for end users, there is a less expensive option for "developers" (very loosely defined), for a modest $9.99/month. The "developer's license" allows up to two installations on two separate computers, so that the "developer" can build/test multi-user applications, or "multi-computer/monitor" applications and/or solutions.
Aside from the ability to use Prepar3D for commercial applications, Prepar3D has the advantage of being a "live" product. It is under continuous development and incremental improvements are periodically released at no additional cost to the end user. Since the initial release, Prepar3d has already released two incremental updates.
All that said however, Prepar3D is not a product for the casual simmer. Lockheed-Martin has realized that there are some pretty "Serious Simmers" in the world, and they are therefore making Prepar3D available to those who's home-based simulations fall into that category.
As for the two unzipped files, simply launch the Setup.exe and install it as you would FSX. :mixedsmi: