General Downloads for printer driver
https://www.zebra.com/us/en/support-downloads/printers/desktop/zp450.html 


Mac information

https://www.zebra.com/us/en/support-downloads/knowledge-articles/installing-a-zebra-label-printer-on-a-mac-os-x-10-5.html 


Go to this link for more detailed instructions. https://shipleap.freshdesk.com/a/solutions/articles/48001185090



Attached are the executables for the PC just in case they get removed from the url. 



You may have to restart the computer AND the power on/off the printer after the driver is installed.