Install a Linux distribution on your Windows system. We suggest you install Debian GNU/Linux, which is the closest distribution to what is used currently by LIGO/Virgo/KAGRA.
This subsystem is a virtual machine installed in a partitioned area of your disk, so you need at least 10 Gigabytes of space available on your disk.
Once the distribution is set up, you still need a few key elements:
A display X-server: a good option is VcXsrv. It is a bit tricky to make it work on WSL, but following all of these steps should work. You will have to launch an X-server session every time you switch on your computer.
A web browser, in order to run the Jupyter notebooks. Google Chrome is a safe option.
Once you have all that installed, follow the instructions for the IGWN software setup.