You do understand that the only version of Windows supported on 7th and 8th gen processors is Windows 10, right? There is no support for RST on Windows 8.1 on this processor.
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Thank you very much for contacting the Intel® Communities Team.
As N.Scott Pearson mentioned, for 7th and 8th generation processors the Windows * version supported is Windows * 10 nonetheless, you can also try using this version of Intel® RST (1063) which was released for Windows 8.1*. Please find the download link here: https://downloadcenter.intel.com/download/26759/Intel-Rapid-Storage-Technology-Intel-RST-User-Interface-and-Driver?product=55005
In addition, with that system you have, I would highly recommend you to use Windows 10* so you can get a better performance of it.