Serviio

I can stream (on a PC) videos and content using MediaBrowser but I was wondering how to link to them directly.

Not certain I understand the question. Serviio provides streaming via DLNA, not direct links. Whatever playback device you use (Media Streamer, Smart TV, Blu Ray Player) must support the DLNA protocol. Some devices do allow linking to a network share (I had an older Panasonic BD player that could do this), but that doesn't require Serviio or any other server software. When linking like this, you don't get the benefit provided by Serviio such as metadata, playlists, category displays, etc.

Well the previous version allowed me to post direct links. How would I directly link to an mp4 file?

I am unfamiliar with what you want to do, so I'll pass to Zip for an answer.