. For macOS 10.12 Sierra, the equivalent legacy versions are Office for Mac 2011 or specific builds of Office 2016/2019 Microsoft Learn Compatible Office Versions for macOS Sierra (10.12)
Since official "free" downloads for these legacy versions are no longer provided by Microsoft, you can use these alternatives: How do I get Office on my MacBook Pro 2010? Microsoft Office 2010 Free Download For Mac Os Sierra
If you need offline software that works on older operating systems like macOS Sierra, these free alternatives offer high compatibility with .docx and .xlsx files: Download Office 2010 - Microsoft Office 2010 has been retired. Obtaining Microsoft Office 365 Word for free. Obtaining Microsoft Office 365 Word for free
Now that we’ve established what doesn’t work, here are your real options. All of these run natively on macOS Sierra (10.12) and are either free or have free tiers. Because there is no legitimate "Office 2010 for
Because there is no legitimate "Office 2010 for Mac" installer, providing a direct download link is impossible. Instead, here is a breakdown of your actual options, ranging from making old software work to modern alternatives.
If you do not have a product key and do not want to risk using unsupported software, free alternatives are highly recommended for macOS Sierra.