There’s no official Google Assistant app for Windows, but there is a workaround to use Google Assistant on a Windows 11 or Windows 10 computer. It’s even easier to use Google Assistant on a Chromebook.
How to Download and Install the Original Google Assistant on Any Windows PC
To get started on Windows, install the Google Assistant Unofficial desktop client and then set it up. There are a lot of steps, but it’s all very simple:
Go to the Google Actions Console and select New Project. Agree to the terms and services.
Enter a name, such as WindowsAssistant, and change the language and region if necessary. Select Create Project.