add instructions to install preview for macOS

addresses MicrosoftDocs#2573

reference/docs-conceptual/setup/Installing-PowerShell-Core-on-macOS.md

@@ -146,6 +146,48 @@ brew cask upgrade powershell-preview
 [cask]: https://caskroom.github.io/
 [cask-versions]: https://github.com/Homebrew/homebrew-cask-versions
 
+### Installation of latest preview release via Homebrew on macOS 10.12 or newer
+
+[Homebrew][brew] is the preferred package manager for macOS.
+If the `brew` command is not found, you need to install Homebrew following [their instructions][brew].
+
+Once you've installed Homebrew, installing PowerShell is easy.
+First, install [Homebrew-Cask][cask], so you can install more packages and install [Cask-Versions][cask-version] which lets you install alternative versions of packages:
+
+```sh
+brew tap caskroom/cask
+brew tap caskroom/versions
+```
+
+Now, you can install PowerShell:
+
+```sh
+brew cask install powershell-preview
+```
+
+Finally, verify that your install is working properly:
+
+```sh
+pwsh-preview
+```
+
+When new versions of PowerShell are released,
+simply update Homebrew's formulae and upgrade PowerShell:
+
+```sh
+brew update
+brew cask upgrade powershell-preview
+```
+
+> [!NOTE]
+> The commands above can be called from within a PowerShell (pwsh) host,
+> but then the PowerShell shell must be exited and restarted to complete the upgrade.
+> and refresh the values shown in $PSVersionTable.
+
+[brew]: http://brew.sh/
+[cask]: https://caskroom.github.io/
+[cask-versions]: https://github.com/Homebrew/homebrew-cask-versions
+
 ### Installation via Direct Download
 
 Download the PKG package