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Run from a checkout, the launcher uses the Python that started it. A Python older than 3.14 without the zstandard package got through the first-run screen and stopped at Gather Build Tools with only "No module named 'zstandard'", after the packages were downloaded. toolchain.zstd_missing now looks for compression.zstd or zstandard when the launcher starts. Without either, the log and the first screen name the Python and give the pip line for tools/requirements-launcher.txt, and Gather Build Tools stops with the same message before it unpacks anything. A release's own Python always has the package; if it ever lacks it, the message says to reinstall NX2navi. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>