Partitioning your system's hard drive with Boot Camp Assistant may erase all your data. In macOS, the Boot Camp Assistant app will help you partition your Mac hard drive to accommodate both operating systems, so you can install Windows from an installation disk or an ISO image stored on a USB flash drive. If you wish to run both macOS and Windows on a single Mac computer, UITS recommends using Apple's Boot Camp utility to install a 64-bit version of Windows on your Mac. If you need more help, visit the Boot Camp. To explore the Boot Camp Assistant User Guide, click Table of Contents at the top of the page, or enter a word or phrase in the search field. How to install Windows on your older Mac. How to install Windows on your newer Mac. No problem-just install Windows on your Intel-based Mac with Boot Camp. Important: If you’re using a Mac notebook computer, connect it to a power source before continuing. Boot Camp Assistant prepares your Mac by creating a new partition for Windows named BOOTCAMP and downloading the Boot Camp support software. Resize your partition, backup your catalina boot drive, downgrade to Sierra or lower if you can, install windows 7 with bootcamp assistant, then restore your boot drive to catalina. Even High sierra won't install windows 7 in boot camp anymore.

Install windows 7 on mac bootcamp