ArcGIS Desktop and ArcGIS Pro can only run on a Windows operating system.

If you are using MacOS or Linux you can use specific software to run Windows on your computer.
Here are the most commonly used programs.

VirtualBox (MacOS, Linux) https://www.virtualbox.org/ No license cost.
Parallels (MacOS) https://www.parallels.com/ Licensed.
VMware Fusion (MacOS) https://www.vmware.com/products/fusion/fusion-evaluation.html Licensed.
Boot Camp (MacOS) https://support.apple.com/boot-camp No license cost.

Here’s the long list.
https://en.wikipedia.org/wiki/Comparison_of_platform_virtualization_software

Installation of ArcGIS on virtualization software.
- Install the virtualization software of your choice.
- Create a virtual machine with Windows operating system. You need installation media and a license for Windows.
- Start the virtual Windows machine and install ArcGIS. https://pluto.slu.se/gispub/install_arcgis_desktop_10_8_1

Installation of ArcGIS on Boot Camp
- You need installation media and a license for Windows.
- Follow these instructions to install Windows on your Mac : https://support.apple.com/boot-camp
- Boot Windows on your Mac and install ArcGIS. https://pluto.slu.se/gispub/install_arcgis_desktop_10_8_1