I guess you haven't been following the news. Users who purchased office 2021 Mac version discovered that edit feature was disabled after the product reached its end of life, and there are tutorials of "fixing" it: https://www.reddit.com/r/macapps/comments/1xf6o5f/fixed_how_.... Something similar to Office 2019: https://youtu.be/KRnno9VIZx0

With Microsoft, especially in the past few years, there is no such thing as "offline version"