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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.