"extraction failed: data error" or similar "exclusive access" issues in Mod Organizer 2 (MO2)

• Exclusive-access root causes:
  1. Open Windows Security → Virus & threat protection.
  2. Click Manage settings under "Virus & threat protection settings."
  3. Toggle off Real-time protection.
  4. DO NOT close the window. (Re-enable it after the mod installs).
  5. Go back to MO2 and install the mod again.
  6. Immediately re-enable Real-time protection.

  If Mod Organizer 2 refuses to extract the archive via standard double-clicking, you can usually force it manually: