..teacher2022:
The newest versions Microsoft are either/or some versions that are
subscription-based or 'one standalone-single purchase' download.
Options will cost, nothing older than maybe last year,
and a new subscription? Maybe a discount ~ or not.
• Buy Microsoft 365 Family & Personal Subscriptions, and Office 2021 - Microsoft Store
https://www.microsoft.com/en-us/microsoft-365/buy/microsoft-365
MS Office Home & Student 2021
One-time purchase for PC and Mac
$149.99
Buy now
"One-time purchase"
The Mac versions options should be listed next to the PC ones.
You may try LibreOffice, free-ware; shows significant promise.
[They also offer an M1 Apple silicon version DL - link.]
• macOS | LibreOffice - Free Office Suite - Based on OpenOffice (microsoft compatible)
https://www.libreoffice.org/get-help/install-howto/macos/
Several versions download portal, old and newest:
https://www.libreoffice.org/download/download/