Kernel upgrade for Zorin-OS-Core-64-20161120.iso

I installed Zorin-OS-Core-64-20161120.iso in 2016 and it has been kept up to date. Only recently, I noticed that the release is at 12.4 but the kernel is still at 4.4 where as a fresh install of 12.4 has kernel 4.15. The repos are the same on both install.

Do I just install 4.15 kernel with apt install?

In view of some kernel update difficulties I have had on older machines at work, I would wait for the updates to come through the stable channels first. Be sure to backup any critical data before attempting to update the kernel!

It may be a long wait for nothing because kernel updates for Zorin 12 has been left behind. The point releases have progress from kernel 4.4 -> 4.8 -> 4.10 -> 4.13 -> 4.15 so why is my 12 updated to 12.1,2,3,4 release still at 4.4?

Hi

statements made are not correct
installed 12.4 ultimate upgrade yesterday and kernel situation is below


if it should be the case on our machine may I suggest you make a backup and install correct kernel version. no sweat.

+++

Also make sure you get your updates from 'Main Server' unless you are on metered access.