Double-click your original AutoCAD 2021 desktop shortcut. Troubleshooting Common Issues Error: "AutoCAD 2021 is not detected"
To ensure your system remains secure from malware and viruses, you should only download language packs from official sources. Method 1: The Official Autodesk Knowledge Network
The language pack must precisely match your software version (AutoCAD 2021). You cannot install a 2021 pack on AutoCAD 2020 or 2022.
This guide is for individuals with a valid license for AutoCAD 2021, including versions from the 2021 Autodesk Design Suites, such as the AutoCAD Design Suite, Building Design Suite, Product Design Suite, Factory Design Suite, Infrastructure Design Suite, and Plant Design Suite.
Once you have downloaded the .exe file, follow these steps to install it:
AutoCAD 2021 software operates natively in the language chosen during its initial installation. If you need to switch your workspace to a different language, Autodesk allows you to do this without purchasing a new license or reinstalling the entire software package. You can achieve this by downloading an official Autodesk language pack.