How To Fix Unarcdll Returned An Error Code14 Upd

The Short Answer

"Unarc.dll returned an error code: 14" almost always indicates a data corruption issue. This means the file you are trying to install is either downloaded incompletely, corrupted, or the storage device (Hard Drive or RAM) is failing to write the data correctly.

  • Open Command Prompt as Administrator.
  • Type: chkdsk C: /f /r (Replace C: with your drive letter).
  • Press Y to schedule the scan, then restart your PC.
  1. Check disk for errors
  1. Press Win + R, type %TEMP%, and press Enter.
  2. Delete everything inside (skip files in use).
  3. Also clear C:\Windows\Temp (requires admin rights).