ElAmigos distributes updates as standalone .exe patch installers or as a full repack. For an existing 1.2.2 installation, follow these steps:

Alan Wake 2 Update from v1.2.2 to v1.2.5 (ElAmigos)

ElAmigos updates are usually designed to be installed one after another (e.g., v1.2.2 > v1.2.3 > v1.2.4 > v1.2.5). Ensure your base game version matches the requirement before starting.