So, You are on Zorin 17 or 18 now? When You are on Zorin 18, You can install it with:
sudo apt install linux-headers-generic-hwe-24.04 linux-image-generic-hwe-24.04 linux-hwe-6.14-headers-6.14.0-37 linux-modules-6.14.0-37-generic linux-modules-extra-6.14.0-37-generic linux-headers-6.14.0-37-generic linux-tools-6.14.0-37-generic linux-hwe-6.14-tools-6.14.0-37 linux-image-6.14.0-37-generic linux-generic-hwe-24.04
When You are on Zorin 17, the 6.8 Kernel is the default HWE Kernel. and when you want upgrade it, You would have to use the Mainline Tool for it.