What mainboard chipset do you have? Intel often concentrate their efforts on newer chipsets with newer RSTs, so it won't install anymore on the older chipsets. One exemption is when you put your controller in RAID mode, then it will most likely install. But that is only a workaround...
I guess you have to stay on the older RST if you have an older chipset. The fixes in newer RSTs are mostly for newer chipsets anyway, as i understand it.