"extraction failed: data error" or similar "exclusive access" issues in Mod Organizer 2 (MO2)
- Exclusive-access root causes:
- Open Windows Security → Virus & threat protection.
- Click Manage settings under "Virus & threat protection settings."
- Toggle off Real-time protection.
- DO NOT close the window. (Re-enable it after the mod installs).
- Go back to MO2 and install the mod again.
- 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: