Open Terminal (on a Mac, press ⌘ Space and type Terminal), paste this and press Return.
curl -fsSL https://use-squire.com/install.sh | shOpen PowerShell (press the Windows key and type PowerShell), paste this and press Enter.
irm https://use-squire.com/install.ps1 | iexSquire opens in your browser to finish setting up. Keep the window open while you use it. To start Squire again later, run squire. Running the command again updates it.