FRIENDS NETWORK UNREACHABLE This failure may indicate that your local network is offline or that the Steam Friends servers are currently offline.

The Steam friends network unreachable error is usually caused by a corrupted cached data, if you are using a beta version of the app, or an bad internet connection.

Given that, running Steam client as an administrator can fix the issue with Steam Content Servers Unreachable and you should be able to download. Here’s how to Run Steam as Administrator: ...