Install Error 1321 'insufficient privileges to modify the file'

Symptoms

Setup fails saying it cannot write to C:\Program Files\...

Likely cause

Not running elevated, or Windows file ACLs are damaged.

Fix

1. Right-click the installer > Run as administrator. 2. If still failing, take ownership of the target Program Files folder (Properties > Security > Advanced > Owner > Administrators > Replace owner on subcontainers) and retry.

Sourced from militarycac.com. Rewritten for clarity.

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