I downloaded the RSTe_and_AHCI_Drivers_GUI_CIM_CLI_3.8.0.1111_2013.10.03.zip file from your support site and use the executable on the GUI directory.
There is no MSI package to install the RSTe software. That is why I made the comment above. MSI packages usually make registry updates that can be used to uninstall the software, this *exe file does NOT do that.
Can you provide information on how to uninstall the RSTe software on a Windows Core system? Just GUI and services, not the driver.
Thanks.