Your Windows user account must have administrator rights to write files to the Autodesk directories.
If you install a non-English language pack (such as Spanish), you can still use classic English commands. Simply type an underscore ( _ ) before any English command in the command line interface. For example, typing _LINE in a Spanish or Japanese version of AutoCAD will successfully activate the Line tool. Troubleshooting Common Issues Issue 1: "Main Product Not Found" Error autocad 2014 language packs
Installation on modern PCs can be finicky. If you are running AutoCAD 2014 on Windows 10 or 11 (which requires workaround patches to begin with), the Language Pack installer may throw "incompatible OS" errors. Users often have to run the installer in "Compatibility Mode" (Windows 7 or 8) to get it to recognize the system. Your Windows user account must have administrator rights