Method 1 : Install Flutter via zip file

1. Download Flutter SDK

Go to https://docs.flutter.dev/get-started/install/macos#get-sdk and download Flutter SDK file. Get Flutter SDK

2. Unzip File

Open terminal and type commands below. Go open terminal 

mkdir ~/development
cd ~/development
unzip ~/Downloads/flutter_macos_2.10.3-stable.zip

3. Set Environment Variable

On that terminal type below command to set environment variable for flutter.

export PATH=“$PATH:`pwd`/flutter/bin"

4. Run “flutter doctor”

Run "flutter doctor" on that terminal to check that flutter is properly installed.

flutter doctor

Method 2 : Install Flutter via homebrew

1. Run “homebrew install flutter”

homebrew install flutter

2. Run “flutter doctor”

flutter doctor