I would suggest booting into Zorin OS Pro, then tapping
esc to enter the recovery menu.
This would be more effective than trying to copy a file from LiveUSB.
At the recovery menu - if the latest stable Zorin kernel is still installed, choose
Advanced options for Zorin and try booting into the 5.11.0-40 kernel.
If neither are installed;
Boot into Advanced Options, then Recovery - Go to the Recovery Menu and arrow key down to
Once networking is enabled, back out to the recovery menu and arrow key down to
Drop To Prompt.
sudo apt install linux-headers-5.11.0-40-generic linux-modules-5.11.0-40-generic linux-modules-extra-5.11.0-40-generic linux-image-5.11.0-40-generic
This should get you to a Known Working Stable Kernel.
Then boot normally into it.
If you want to then try installing the 5.15 kernel... That is on you. I wouldn't recommend it.