Microsoft has always maintained separate codebases for Windows and Mac. During the Office 2010 era, the Mac equivalent was (which had a different interface and file format handling).
Virtual machine (recommended if you need Office 2010 specifically) Microsoft Office 2010 Free Download For Mac Os Sierra
If you are looking for "Free" because you want to avoid a subscription, be aware that modern Office apps require a license. However, they run perfectly on macOS Sierra. Microsoft Office 2010 Free Download For Mac Os Sierra
You have legitimate Windows-only software and need to run it on a Mac running Sierra. Here is the method (requires owning a valid Office 2010 license key). Microsoft Office 2010 Free Download For Mac Os Sierra