Not sure about a completely free 365 Office version, or MS Office for Mac.
{See official link below to Microsoft Office/365 Office to buy. - One of these
seems to rely on the Cloud and allows some sharing between iOS/macOS.}
This was the version in discussion elsewhere which you could pay monthly
and use, or pay a higher price and have rights to use a software download.
About Apple Apps: IF your new Mac hasn't any of the 'iWorks' applications
installed or they were discarded, it may be possible to get them free. These
can work to your advantage as they can open documents from MS office.
• Get Apple apps on your iPhone, iPad, iPod touch, and Mac - Apple Support
Above links to iOS versions (iPhone, iPad, iPod Touch) and macOS or OS X
version; the links go to App store &/or Mac App Stores. Page link has details.
{These 'apps made by apple' may not be available in your country or region.}
This is an official Microsoft link to their Office products:
• Office 365 for Mac, Office 2016 for Mac ~ microsoft office for mac:
//products.office.com/en-us/mac/microsoft-office-for-mac
Following is a free 'office-like suite' from other software authors, such as it is:
LibreOffice, Download, download LibreOffice, download options, Windows, Linux,
Mac OS X. Discover. What is LibreOffice? ... Mac OS X x86_64 (10.8 or newer required ...
https://www.libreoffice.org/download/
The Apache OpenOffice may not offer a latest build for macOS Sierra 10.12.x.
The Free and Open Productivity Suite. ... Blog; Extend; Develop; Focus Areas; Native
Language; home » porting » mac. Apache OpenOffice for MacOS X ... Apache and ...
openoffice.org/porting/mac/ -or/maybe- http://www.openoffice.org/download/
There is a mirror or perhaps questionable source here; seems to run up my mac at idle:
Apache OpenOffice | SourceForge.net
sourceforge.net/projects/openofficeorg.mirror/
So LibreOffice may be adequate; I've not used an office-like suite for Mac OS X in
a long time. My older Macs still have AppleWorks, others have iWorks; newer have
those 'pages/keynote/numbers, etc' as separate named parts, that work together.
I've been looking around awhile, so your thread only had one post about an hour ago
when I started back-checking on any 'microsoft' product. ~ I'd seen topics about an
update to a newer MS version a few years ago, if you'd already bought older one.
Somewhere I've a few early 'Office for Mac' from the dinosaur age, some on CDs.
And a nice MS Word 5.1a on floppy disk. Worked a treat in old Macs...
Good luck & happy trails! 🙂