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Light SDK is a macOS app (macOS 12 or later). Windows support is coming soon.
1

Download the app

Grab the latest LightSDK-macOS.zip from the LightSDK releases page, then unzip it.
2

Move it to Applications

Drag LightSDK.app into your Applications folder.
3

Open it the first time

Right-click the app → OpenOpen to bypass the Gatekeeper warning. macOS remembers this, so future launches are a normal double-click.
The right-click step is only needed because the app is ad-hoc signed. A notarized build opens with a normal double-click.

Windows

A Windows build of Light SDK is coming soon. For now, Light SDK runs on macOS only.