First download the new kernel.
Then navigate to /System/Library/Kernels and replace the current one with the new one you just downloaded.
Now navigate to /System/Library/Caches and delete the following folder, com.apple.kext.caches
Now go to /System/Library/PrelinkedKernels/ and delete the file prelinkedkernel
Once you've copied the kernel open Terminal and run the following command,
sudo kextcache -u /
Installed Operating Systems: Catalina 10.15.4 - Windows 10 Pro (Insider)
CPU: Ryzen 5 3600 Motherboard: MSI MPG X570 Gaming Plus RAM: 16GB DDR4 3200MHz Graphics: ASUS ROG Strix RX560
HDD: 960 EVO 500GB - MX500 250GB - 2TB Seagate - 640GB WDC - 500GB WDC LAN: RTL8111 Sound: HDMI
Other: USB Bluetooth - USB Wireless Mouse and Keyboard Bootloader: OpenCore