Instructions.

Install from ISO or https://setup.office.com
Once installed, you activate by the online using Word or Excel.
Genuine keys, 
Office Professional 2019
‪Microsoft Corporation‬
• One-time purchase for 1 PC
• Classic 2019 versions of Word, Excel, PowerPoint, and Outlook, plus Publisher and Access
• Microsoft support included for 60 days at no extra cost
• Licensed for home and commercial use

All languages included. Compatible with Windows 10*
*Go to office.com/systemrequirements for compatible versions of Windows 10 and for other feature requirements.