FSX gold installs with no problem But to this day I still cannot install Acceleration as you do not get a screen to activate it and it deactivates FSX I had to install SP1 and SP2 manually but I do not think I went about it the right way as I still have some problems like sometimes if I change aircraft the new aircraft will show up and then vanish or it displays with some of the textures missing.
But I also have FSX steam that I got for free because I was a beta tester.
I plan on trying one more time to install FSX Gold and Acceleration to see if i can get it to work.
I would suggest that you do not install FSX in the default folder. The best place is on a drive without your operating system on it. But any place on your C drive other than the Program Files (86) folder
True there are ways around the problem by turning down your User Account control. Myself I do not like that idea as you could open yourself up to other problems.