A family of Microsoft word processing software products for creating web, email, and print documents.
The Office 2013 Upload Center is a utility to sync Office 2013 files with your OneDrive account. It is not an Office installer.
If you had Office 2013 installed previously, it may be listed with an installer on the Subscriptions page of your Microsoft Account. If you don't see it there, you will have to reinstall using your original install media and product key.