Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello
If you purchased from Microsoft, you can install directly. Your Microsoft account serves as license. No extra product key is needed.
Please go to https://www.office.com
Sign into the Microsoft account you used for the subscription. Click on Apps on the left.
Then on the upper right, click on "Install apps". This will now download the installer file. Once downloaded, click on the file to install. It will install the Desktop version of the apps for you then.