The majority of issues are due to the Office licensing, Windows updates, insufficient system resources like disk space, Internet connectivity, etc. So this article provides the solution for different kinds of office issues pertaining to Microsoft office 365 update error code 30125-9 .

Diagnose your computer to fix office 365/2021 Error code 30125-9 (500)
There will be a log for every action on your computer which records all the events. It is known as an Event viewer. This is a Windows Inbuilt program under system tools, it provides all the information for the problem causing keys. This could cause due to the failure with your Windows related services and the executable file is unable to read the files when you try installing Office 2021. There may be issues with the start up programs which can found under System Configuration.
Perform system file SFC scan
System file scan in a short SFC scan is windows inbuilt program to fix corruption files of an operating system. It can fix several updates failures, other violations done by several mismatched files. To Run system file scan in your windows operating system, first Open command prompt (CMD) in admin mode and Run the command SFC/SCANNOW
Office 365 installation Error code 30125-9 (500) fixes with this scan if there are no serious issues. If you see any file violations that exist after the scan, then check Event viewer to understand the causes of office 365/2021 update error . Watch the video to know how to perform SFC SCAN to fix office 365/2021 Program Error code 30125-9 (500).
Unable to start the Office 365/2021/2019 installation program
This message explains that the office 365 program has been stopped by your Windows and unable to start the office program. The computer must be scanned using the Windows system file scan process. This also shows that Office related files are missing from Program folders. If this occurs recently with any of your clean-up programs, a system restore could help you to fix the same.
In conclusion,
If you can’t find any reasons for the issues then just take a chance to do a clean office installation to save your time. Similarly, you can also chat to our support agents on this page.