Install
The Windows local connector, and the toolchain archive it establishes a collection from.
Windows local connector
A signed MSIX package. It puts llambda-local-connector on your PATH, and the chat pane talks to it on your own machine rather than to the site.
Toolchain archive
Prebuilt executables, no source. new-gizmo unpacks this into a collection you can build gizmos in.
Download the toolchain (tar.gz)
The Starting a gizmo page carries this through to a gizmo that builds and passes its tests.
Haskell toolchain prerequisite
Run this first on Windows in a non-admin PowerShell session.