If you've purchased a legitimate copy:

: Always up-to-date with the latest features, security patches, and AI-powered tools. It includes 1 TB of OneDrive cloud storage and supports real-time co-authoring.

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: Your computer's processing power could be secretly harnessed to launch cyberattacks or mine cryptocurrency. Zero Security Protections

LibreOffice is the most robust and well-known free alternative to Microsoft Office. It is developed by a global community of volunteers and backed by The Document Foundation.

That being said, here's a general guide on Microsoft Office 2010 Professional Plus, which includes information on its features, system requirements, and how to find and use it, while also touching on the topic of activation:

No new security patches, bug fixes, or technical support are provided.