Step-by-step Guide to download and install Microsoft Teams for Windows.
Follow these instructions:
Head over to https://www.microsoft.com/en-us/microsoft-teams/download-app
Scroll down and click Download Teams.
Save the file.
Go to where you saved the filed and run the setup wizard.
After installation, be sure to sign in using your school account.
That should be it! You can open Microsoft Teams from the Start menu.