Please follow these steps to download, install and activate Microsoft Office 2019 Home and Business for PC/Mac successfully on your computer:
1. Go to Microsoft's website: setup.office.com 
2. Create a new Microsoft account or sign in to your existing one
3. Enter the product key provided by us
4. Download and install Microsoft Office 2019 Home and Business for PC/Mac
If you don't have a product key, get it here.