If you are a business or educational institution with a Volume Licensing agreement, you can download from VLSC. These ISOs contain every language pack for a specific Windows 10 version pre-packaged. This is the gold standard for IT pros.
You are trying to install a language pack for a different build/version of Windows 10 (e.g., 21H2 pack on 22H2). Solution: Verify your Windows 10 build number ( winver command) and download the exact matching pack from the Microsoft Update Catalog. windows 10 language pack offline download