How to fix Error Code 30045-4 in Office 365/2019/2021 Installation
First Over, we need to stop Microsoft Office Click- to- Run (SxS) processes using Task Manager.
To End Microsoft Office, Click- to- Run (SxS) processes, open Task Manager, look for Click- and- Run process, right- click on it and select End Task.
Check if the issue persists. generally, the issue does persist, so, you have to perform the coming step as well