@Faceoff Thanks for giving the requested answers.
After having done a look into the related package I don’t see any reason why you were not able to get the “Universal Intel RST Drivers & Software Set v11.7.4.1001 mod+signed by me” installed.
Which Intel RAID driver was the on-board Intel SATA RAID Controller using at the moment, when you tried to install the Intel RST(e) Software v11.7.4.1001?
Note: The best way is to install the related “pure” driver as first step and to install the Software thereafter.