Graphisoft does not offer an in-app "one-click" language switcher for full localization. Instead:
Using the correct localization is vital for professional documentation: archicad language pack
During the setup, specify a custom folder name to keep it separate from your current installation. Open the new version and verify your license works. Graphisoft Archicad 28 and the Global Library Starting with Archicad 28 , Graphisoft introduced the Global Library Graphisoft Community Access All Objects: Graphisoft does not offer an in-app "one-click" language
Be careful when importing custom shortcuts or "Work Environments" from an English version to a localized one, as this can sometimes result in a confusing mix of languages in your menus. The Archicad 28 "Global Library" Revolution Graphisoft Archicad 28 and the Global Library Starting
When downloading packs, you will often see "English (US)" and "English (INT)." This confuses many users.