I tried using Balena Etcher like the Zorin website suggested. I had recently converted my 2 older laptops over to the Zorin OS. I had lost my desktop PC to a Microsoft critical update that killed the PC. So after taking out the hard drives & the old CPU ( with cooler fan ) bought new ones to replace them. My problem was trying to create the Zorin Pro bootable USB. The Balena Etcher gave me an ERROR message Connection to Sidecar flasher failed. Tried the ISO Image Writer but the 2 files needed were impossible to find. USB Image Writer - same problem. What did work was the Disks program in System Tools & it was flawless ! Very easy to use. The Bootable USB downloaded during the Bios program startup hitting the F12 key to get to the Boot menu. Spent too many hours trying to get this bootable USB to accept the Zorin OS. Hopes this helps someone out there who has the same problem.