A family of Microsoft word processing software products for creating web, email, and print documents.
Did you purchase your Office subscription from Microsoft? In that case, you should be able to install the product from your associated account at https://account.microsoft.com/services.
If you have a product key, go to https://setup.office.com where you will be asked to sign in to an account, or create an account and then sign in to it; the next step is to enter the product key which associates the account with the key. You can only do this once, and from then on, you must use the account to manage your subscription (including installation).