Microsoft offers discounts for students who are enrolled in a course and have an .edu email address. Note that student licenses are for personal use only and exclude use for church-related functions.
If you want to take advantage of the offer, contact firstname.lastname@example.org to request an email address. Read more here. Note that upgrading or reinstalling Windows is not an easy task, so you should take that offer only if you are able to do the upgrade yourself or someone locally is helping you with it.