Unzip it onto an empty usb drive, 8-16gb works best for some reason it hates big ones then put the usb stick into the harvest right prior to booting up. Some HRs have options to update the firmware by hand. There was a youtube channel that had all this posted but it got deleted for some reason so you might have some googling to do
If you have a better version than the ‘home’ model chances are you don’t need this and you just need to turn the final dry temps down