When the Office VL install fails with setup.exe 1603 (C2R 'SXSMSI' prereq) AND no
reboot is pending AND the common causes are clean (verified via telemetry:
msiserver healthy, EventLog running, no DisableMSI policy, no stale InProgress MSI,
disk OK) AND a manual DISM/SFC + reboot did not help, the install subsystem itself
is wedged. New Repair-OfficePrereq (consent-gated; $env:KMS_DEEP_REPAIR=1 to
auto-consent) goes one level past DISM without uninstalling anything: re-registers
the Windows Installer engine (msiexec /unregister + /regserver) and resets the
servicing/update caches (SoftwareDistribution + catroot2), then prompts a restart
and re-run. Offered automatically from Reinstall-OfficeVL on a 1603 with no pending
reboot. ODT exit code now exposed via $script:OdtExitCode.
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