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16c29463f9
The download endpoint had a dangerous fallback that silently served the wrong binary when the requested platform/arch combination was missing. If a Docker image shipped without Windows binaries, the installer would receive a Linux ELF instead of a Windows PE, causing ERROR_BAD_EXE_FORMAT. Changes: - Download handler now operates in strict mode when platform+arch are specified, returning 404 instead of serving mismatched binaries - PowerShell installer validates PE header (MZ signature) - PowerShell installer verifies PE machine type matches requested arch - PowerShell installer fetches and verifies SHA256 checksums - PowerShell installer shows diagnostic info: OS arch, download URL, file size for better troubleshooting This prevents silent failures and provides clear error messages when binaries are missing or corrupted.