Publisher is one of the programs of the Microsoft Office suite that is not available in the Mac version, that is to say, that it is not possible to download this software if you are an Apple computer user. Along with Access, these are the two programs that Microsoft does not offer on this platform, regardless of the subscription plan you have. Publisher lets the user layout all kinds of documents, however, on Mac, it is needed to use another option. Most options are a bit harder to use, but they may be your only solution if you want to work with this program.
The first one is the native BootCamp app, which lets the user make a partition on your hard drive where you can install the Windows 10 ISO file. The automatic wizard takes care of everything, and lets you continue to use Windows programs on your Mac computer. Once you have this partition set up on Windows, simply install Publisher as usual.
On the other hand, you can find applications that emulate Windows on your Mac computer. In the App Store for Apple computers, you can find Parallels Desktop and VMWare, which do exactly the same as Bootcamp.
You can also find a very interesting option called Microsoft Remote Desktop, thanks to this app, you can connect with your Mac remotely to another Windows computer you have at home. If you have Access installed there, you will be able to use it.
As you can see, not having a Windows computer is not a problem, thanks to emulators, you can enjoy Publisher on your Mac computer.