
Unfortunately, "buying" Office has become a big decision tree.

I go through many options in this article: #6 Non-MS alternatives to Office, not exactly identical, but free or cheap #5 Office 365 Family, rent / pay for-ever US$100/year, up to 6 users, each on up to 5 computers #4 Office 365 Family, "free" if you get a "share" from someone who has paid, on up to 5 computers each #3 Office 365 Personal, rent / pay-forever US$70/year, 1 user, up to 5 computers #2 Office 2019 Home and Student, buy with 1-time payment, 1 computer #1 Office Online, free, but not fully functional Short form, you have several basic options: That means you have to buy a one-time payment license for 2019 or get a 365 "keep-paying-forever" subscription. It appears your school subscription has expired.

You have to have an Office license of some sort. In theory the school account should also show the expired subscription. So, I'm guessing that you had 365 Education provided by the school, and now that subscription has expired. Yes, 1 year is a typical subscription length.
