Download the full installer for your target language version. Make sure you also download the latest update for that language version after the base installation.
Browse your computer for the library folder of the other language version (if you have downloaded it) or an external localized library folder. Click .
When you switch languages, your project environments will change. Keep these factors in mind to avoid data issues: The Template Challenge archicad 26 change language
Certain regional add-ons are only coded and supported for specific localized versions. Step-by-Step: How to Change Your Archicad 26 Language
These often provide broader language access. Depending on your region, educational licenses may allow you to access multiple language versions. For instance, if you live in Luxembourg (which has multiple official languages), you may receive access to German, French, and International (English) versions, each with its own serial number. Download the full installer for your target language version
After restarting ArchiCAD 26 (or your computer), the interface should now display in the language you selected.
If you encounter a greyed-out menu or missing options, remember to check if you need a Multilanguage Installer. For most users on subscription plans, the full suite of languages is available out of the box. Step-by-Step: How to Change Your Archicad 26 Language
If you open a project created in Archicad 26 GER (German) inside Archicad 26 INT (International), you will likely see heavy missing library warnings. The objects exist, but their internal GUIDs and naming conventions differ.
