why isn't macOS 12 an available update. mine only goes to 11.7

Look into the Free LibreOffice, it handles MS Office files like Word & Excel, & Page Layout…

https://www.libreoffice.org/

Thanks to Matti Haveri…

MS Office for Mac Mini - Apple Community

LibreOffice 4.0.6.2_MacOS_PPC works in OS X 10.5.8 (last official PowerPC version).

LibreOffice 4.3.7.2_MacOS_x86.dmg (and x86-64?) works in OS X 10.6.

LibreOffice 7.0.4 works in macOS 10.11 and 10.14.

https://downloadarchive.documentfoundation.org/libreoffice/old/

Thanks to Servant to Cats…

LibreOffice is up to

• Version 7.5.4 – Requires Mojave or later
• Version 7.4.7 – Requires High Sierra or later
• The LibreOffice site is now offering
• Version 7.6.2 – Requires Catalina or later
• Version 7.5.7 – Requires Mojave or later

Release notes indicate that as of August 2023, new versions of LibreOffice will likely require Catalina or later.

And thanks to VikingOSX…

Let's not overlook SoftMaker's Office 2021 suite which has familiar Word and Excel UI design, and opens these documents in their native formats.

upgrades to Mac OS high Sierra - Apple Community

Issmi wrote:

Hello. I have the same problem. Have you figured out how to solve it? I have a MacBook Air from early 2014 and the OS is macOS Bir Sur version 11.7.10. I cannot install MS 365 on it. Appreciate any advise.

The Age of this computer will Govern what newer version of macOS it will Qualify to install. 

Use About this Mac from the Apple Icon on Desktop - the required Information will be there.

Does this computer appear as Listed and qualifying for an upGrade to a newer version of macOS ? 

Computer Qualify for the Monterey upgrade

macOS Big Sur 11 hardware requirements

Sorry but the MBA 2014 does Not Qualify for any more upGrades

globallifestyles wrote:

I need to update to microsoft 365 excel and it won't work until i update my software to version 12

The Latest version of Big Sur is now at 11.7.10

The Age of this computer will Govern what newer version of macOS it will Qualify to install. 

Use About this Mac from the Apple Icon on Desktop - the required Information will be there.

With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install.  For Best results use Safari to commence the download as Others may not work.

Safari will open a redirect and open the Apple Store where the download can commence.

Does this computer appear as Listed and qualifying for an upGrade to a newer version of macOS ? 

If Yes, suggest having at least 50 GB of Empty Space on the drive.

It will allow the Full Version ( about 12.xx GB ) to download, expand and then commence to install.

If there is Third Party Security Software installed - remove it.

It will interfere with both the download and installation process.

The below links will help identify which version of macOS  this computer may Qualify to run.

Computer Qualify for the Monterey upgrade

macOS Big Sur 11 hardware requirements

Make Time Machine Backup  before doing any upGrades 

Hello. I have the same problem. Have you figured out how to solve it? I have a MacBook Air from early 2014 and the OS is macOS Bir Sur version 11.7.10. I cannot install MS 365 on it. Appreciate any advise.

You're welcome my friend, great news that I could help you. :)