The shallow present-check passed a file that merely existed, so a partially
transferred payload (e.g. a truncated PC-DMIS MSI) looked PRESENT and was never
re-pulled - then failed to install because it was incomplete. Replace it with a
per-item robocopy that compares size + timestamp on every file and re-pulls
anything missing OR partial, skipping ones already complete. VerifyOnly uses /L
to report INCOMPLETE without changing anything.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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