Firectl can be installed several ways based on your choice and platform. 
brew tap fw-ai/firectl
brew install firectl

# If you encounter a failed SHA256 check, try first running
brew update

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Sign into Fireworks account

To sign into your Fireworks account: 
firectl signin
If you have set up Custom SSO then also pass your account ID: 
firectl signin <ACCOUNT_ID>

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Check you have signed in

To show which account you have signed into: 
firectl whoami

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Check your installed version

firectl version

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Upgrade to the latest version

sudo firectl upgrade