I was helping a client start to roll out their Office 365 Pro Plus click-to-run installs and some of their users were getting Error Code 30174-4

After looking around online to find anything about this error, most hits had to do with the Network connections on the machine, namely laptops with multiple network connections. In the case of this client, they had a wired LAN on one subnet and a wireless LAN on another. Plus they have multiple internet connections for redundancy.

On top of that, they also had a Cisco VPN client adapter, and several notorious Microsoft Virtual WiFi Miniport Adapters. Once all of these were disabled besides the wired LAN, the install went without a hitch!