Installing Heroku CLI on macOS Catalina
The Heroku CLI is available to install via Homebrew. Homebrew is a 3rd party, community supported package manager for macOS.
If you have Homebrew installed, simply run the following command-line to install Heroku CLI (instructions here):
brew tap heroku/brew && brew install heroku
If you do not already have Homebrew installed, install it by running the following command-line (instructions here):
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Using Homebrew provides a seamless and hassle-free experience for installing supported 3rd party packages such as the one in question.