What should I know before installing Office 2021?

This product can be installed on a single computer and, once activated, will stay activated permanently.
There is no upgrade option for this product. If you want to upgrade to a newer version, a new purchase is required.
The Office 2021 Professional Plus edition is suitable for home, educational, or business use. If your business is subject to Microsoft audits, we recommend consulting Microsoft to inquire about Retail licenses and verify if these licenses comply with audit requirements.
This license is not compatible with Servers running RDS CALs; only volume licenses, which we do not provide, will function in such cases.
This edition of Office is compatible only with Windows 10 and Windows 11 computers.
To install and activate this product, you must remove any existing Office edition on your PC. This includes new PCs with a trial edition of Office 365. To remove it, we suggest using the Microsoft support and recovery tool, which checks your PC for prior installations. Click on the following link to download the Microsoft tool.