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The installer's InstallAllUsers=1 needs admin (runner service isn't elevated) so Python landed in the per-user LOCALAPPDATA dir, not C:\Program Files; the hardcoded PATH prepend missed it -> 'python not recognized'. Switch to a per-user install and locate python.exe across the known dirs. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016yT89n4zR4qbrySoSiEyZs