Try this. Open a browser and go to the store site. Make sure you are logged in there.
Open up FPSC Reloaded. Go to files/download store items and let it go thru the checking for and downloading of files you own.
That might get it for you. If not then contact a mod by email and they will check out the download and report back problems or fixes for you.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 4gb RAM, Nvidia gtx660, Windows 7 Pro 64bit