I think I've figured out what went wrong. Once I downloaded the 2-files, SP1 and SP2, I didn't do anything more to them. They were just stored in my PC waiting for me to do something. I repeated the whole process over, and discovered this to be true.
Now the question is, what do I do with them? Where are they supposed to reside? I assume somewhere withing the FSX program files, but I don't know where.
One at a time, tell me what to do with SP1 (fsx_sp1_ENU), an Application file.
Next, SP2 (fsx_sp2_ENU), a Windows Installer file.
Thanks in advance.