Why don’t you try this method to fix error 8505129?
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Error Code 8505129 is referred to be a problem with the broken registry on your system as per this Microsoft article for Windows 10 users.Most of the other articles advise you to repair the program or reinstall the program. But we assume you are reading this today because the issue is still not resolved.
https://officelivesupport.com/error-8505129/