A family of Microsoft word processing software products for creating web, email, and print documents.
Hello, thank you for reaching out to Microsoft Q&A.
The latest version of Office apps is compatible with your Mac OS version 15.7.7
If you cannot add or edit text in a new Word document, the issue may be due to licensing or activation.
When you sign in with your Microsoft account on the Services & Subscriptions page here, do you see your Office license 'Office Home 2024' listed?
https://account.microsoft.com/services
If you see your license active, you can use the Office License Removal tool here to remove all the previous traces of the Office license installed on your Mac and then reactivate them.
Download the tool from the link here and follow the steps-
How to remove Office license files on a Mac
If you still need help, let me know.