The online version is launchable here.
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For Arduino, Circuit Playground Express, ESP-8266, Robohat-MM1, and Raspberry Pi Pico boards, install the server firmware. See the Preparing Your Micro-Controller section of the User's Guide.
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Launch the Scratch3 Editor using either the online or offline sites described in the Ready, Set, Go/Launch The Scratch3 Editor section of the User's Guide.
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Select your extension and start coding!.
Read the Installation And Usage Guide.
