: Visit setup.office.com and sign in with your Microsoft account .
Run the downloaded installer file (e.g., Setup.exe on Windows) and follow the prompts to complete the process. : Open any Office application, such as Word or Excel. : Visit setup
as a full, permanent download. It is a one-time purchase typically costing between $120.00 and $149.99 : Visit setup
If you do not have a product key, you can still use Office features through these official, free channels: : Visit setup