From the Terminal
Compiling and Installing RocketRaid RR64xL drivers on Linux 5.x
wget https://raw.githubusercontent.com/dsiggi/RocketRAID/master/sys-block/rr64xl/files/rr64xl-kernel-5.patch
wget http://www.highpoint-tech.com/BIOS_Driver/RR64xL/Linux/RR64xl_Linux_Src_v1.4.0_16_09_20.tar.gz
tar xf RR64xl_Linux_Src_v1.4.0_16_09_20.tar.gz
patch < rr64xl-kernel-5.patch
cd rr64xl-linux-src-v1.4.0/product/rr64xl/linux/
sudo make KERNELDIR=/usr/src/linux