Yeah, I use Fight Pass. You get access to the ENTIRE library of UFC fights, as well as a ton of other former promotions (PRIDE, Strikeforce, Invicta, Pancrase, etc.) There are usually 2 (occasionally 3) UFC Fight Night cards a month which you can watch on Fight Pass live. For PPV (numbered events) you get the prelims, but have to buy the main event. However, usually a couple weeks after a PPV airs it gets added to the Fight Pass library, then you can watch it. I'm not sure how long you've been watching MMA, but it is really great if you are new to the sport. For example, they would likely have a Conor McGregor collection with all of his UFC fights, as well as fights from other promotions that you can go through and watch all of them. I'm starting to sound like a shill, but they also improved the interface dramatically about a month or so ago, so now it is way easier to use/find specific fights you are looking for.
Conor vs Diaz I will be on Fight Pass, but you will probably have to wait a couple weeks for Conor vs Diaz II to get added.