Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello ANDREWPICKERALL,
It is mainly occurs when you tried to install office or while installing office 365 and it gets failed. Error Code 30045-27 may occur due to following reasons:
Due to Microsoft Office system file get corrupt.
Previous installation had not removed properly.
Windows Firewall not allows to network access.
You may download partial setup.
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Let me know if it helps, have a good day