@canadrian Just download it from Raspberry Pi official website. It is convenient.

Zdenek,
Don’t worry. It is very easy. The respeaker mic sensor has many detailed connection guidance. You can visit respeaker wiki first.
Respeaker-wiki
If you have any question, I am happy to share my experience.

I did a magic mirror with ReSpeaker 4 Mic Linear Array to add voice interface to a Magic Mirror. It is very interesting. Children like it so much. hahah
As using a 4 Mic Linear Array, we are able to detect sound Direction of Arrial (DOA) which can be used to provide some creative functions. We can use beamforming to enhance a specific direction’s sound. It is really a good sensor to do voice related projects. The link is as below.
respeaker-mic

Material:
Raspberry Pi 3B
ReSpeaker 4 Mic Linear Array（sound card）
HDMI display
two way mirror
frame
SD card
Raspberry Pi 3B
ReSpeaker 4 Mic Linear Array（sound card）
HDMI display
two way mirror
frame
SD card

:grinning_face_with_smiling_eyes:

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Software Tutorial for you

Setup Raspberry Pi

Download a customized pi image， which includes the sound card’s driver and some voice related packages (Do not use the lite version for we need desktop enviroment to show GUI). We can write the image to a SD card with rufus (very tiny but only for windows) or ether.

If you don’t have any extra keyboard to access and configure the Raspberry Pi， you can setup WiFi configuratio and enable SSH before first time boot. To do that, Juse add a file named ssh to the boot partition of the SD card, which enables SSH, and then create a file named wpa_supplicant.conf with the following content, replace ssid and psk with yours

country=GB
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
     ssid="WiFi SSID"
     psk="password"
}

Power on your Pi， use Pi’s IP or raspberry.local（requires mDNS support， need to install Bonjour on Windows） to login via ssh (On Windows, putty is a handy ssh client).

Install Magic Mirror

To install Magic Mirror software package， just run：

bash -c "$(curl -sL https://raw.githubusercontent.com/MichMich/MagicMirror/master/installers/raspberry.sh)"
This command will clone MagicMirror repository from github to ~/MagicMirror， install node, npm and other dependencies.

Note: Do not use apt install to install node and npm, node and npm in the deb repository is kind of outdated. Remove them if already installed.
Install Magic Mirror modules: MMM-Remote-Control and MMM-kalliope

cd ~/MagicMirror/modules
git clone https://github.com/kalliope-project/MMM-kalliope.git
git clone https://github.com/Jopyth/MMM-Remote-Control.git
cd MMM-Remote-Control
npm install

and then add the configuration of MMM-Remote-Control and MMM-kalliope to moddules of ~/MagicMirror/config/config.js

{
    module: "MMM-kalliope",
    position: "upper_third",
    config: {
        title: "",
        max: 1
    }
},
{
    module: 'MMM-Remote-Control'
    // uncomment the following line to show the URL of the remote control on the mirror
    // , position: 'bottom_left'
    // you can hide this module afterwards from the remote control itself
},

restart MagicMirror to enable the new configuration. Use the following command to test if we can send a message to MagicMirror

curl -H "Content-Type: application/json" -X POST -d '{"notification":"KALLIOPE", "payload": "my message"}' http://localhost:8080/kalliope
Configure Weather module

By default, a weather module using OpenWeatherMap is included， we need sign up OpenWeatherMap to get a API key and fill the key to ~/MagicMirror/config/config.js

Set Google Assistant

Go to Introduction to the Google Assistant Library to install and setup Google Assistant Library

After authorization, we can just run mirror_with_google_assistant.py to start the Google Assistant for the Mirror.