The current XLlama Windows add-in is installed with XLlama-Setup.exe and uses Excel-DNA with a task pane. The older classic VBA XLlama remains a separate product with its own files and documentation.
This guide describes the installer edition. Its formulas are named XLLAMA.PROMPT and XLLAMA.EXTRACT. If you previously installed an add-in that registers the same names, unload that old add-in before using the new one.
The experimental Office.js edition is archived. It is not the current installation route, and its chats and settings are not migrated into this edition.