If you have anything on it, take a backup because it will be formatted when creating the Windows 10 installer. Insert your USB pen drive with at least 6 to 8GB of free space. Since you're on a Mac, you'll get to bypass the Media Creation Tool and download the ISO file directly to your computer. Step 2: Download Windows 10 ISO and Insert USBĭownload the ISO file for Windows 10 from the official Microsoft website. Make sure you download an authentic copy of the DMG file from the official website. Step 1: Download and Install UUByte ISO Editor App on Mac Catalinaĭownload and Install UUByte ISO Editor for Mac. Support latest macOS Catalina and Windows 10.Extract content from ISO image to local hard drive.Edit ISO files and repack into a new one.Easily create Windows bootable USB and DVD.Support large Windows 10 ISO file (> 5GB).