A background process (e.g., antivirus, Windows Defender) is locking the executable.
The language pack is looking for a specific registry key (usually HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\R20.1 ). autocad 2014 language packs
You must have a base version of AutoCAD 2014 already installed. Language packs are not standalone installers. A background process (e