After seeing the struggles users can go through to make our fonts work for their Windows user (see issue spyder-ide/spyder#21458) and taking into account that there won't be a fallback for Spyder 6, I think we need to provide another solution for them.

That's why I think we should add a script here (either in Python or a Batch script) that we can call from Spyder (or tell users to run in a terminal) to install our fonts as admin.

This SO post has some ideas to get started with this:

https://superuser.com/questions/201896/how-do-i-install-a-font-from-the-windows-command-prompt