In this video I will show 3 ways to set up and use the Freerouting Autorouter plugin for KiCAD 7.
I will guide you through all the steps with an example.

0:00 Introduction
0:58 Method#1: Install via KiCAD Plugin manager
2:28 Basic use of autorouter
3:21 Method#2: Install via zip file
4:42 Method#3: Offline via DSN export
6:55 Tips for best autorouting results.
7:07 Tip#1: Component placement.
7:26 Tip#2: Manually layout critical tracks.
8:28 Tip#3: Set PCB design rules with netclasses.

Links:
Download Java JRE17 (needed for Autorouter) : https://adoptium.net/enGB/temurin/re...
Method#2: Download Freerouting zip file at: https://github.com/freerouting/freero...
Method#3: Download offline Freerouting Installer at : https://github.com/freerouting/freero...
Kicad 7 Tutorial:    • KiCAD 7 PCB Layout in 5 steps  
How to set up DigiSpark USB:    • Make your own DigiSpark USB!