With the advent of Office 2019, Microsoft has moved away from GPO deployment via MSI. There is no MSI of Office, Visio, Project, etc available to download anymore. Microsoft is moving toward using SCCM or the Office Deployment tool. I was tasked with coming up with a method for deploying Office via GPO in a fully automated manner.
There may be more than one way to accomplish GPO deployment of Office, and I do not claim to have the best method. It took me quite a bit of research and troubleshooting to get this method to work. I hope it helps someone looking to accomplish the same thing I was.