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Do you mean you can't install the latest version of Office from Office 365 Portal? If yes, please follow the steps below to troubleshoot this issue:
1. Login to Office 365 Portal.
2. If you are using Office 365 Small Business Premium, you need to assign Office 365 Small Business Subscription license to the user. If you are using Office 365 Enterprise, you need to assign Office Professional Plus license to the user.
3. Install Office on your PC with Office 365 referring to the link below:
If the issue persists, please provide us with more detailed information, such as error message, a screenshot of your issue.
How are things going? If you need further assistance, please let me know.