Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Typically, you install from your associated account at https://account.microsoft.com/services.
I take it you have a subscription which is called Microsoft 365 Personal, Microsoft 365 Family, or Microsoft 365 Premium?
In particular, keep in mind that Microsoft 365 Basic only lets you install the web apps, and not the full desktop apps.