UFC on ESPN+ has become very easy and convenient. The only thing you need is a subscription. With a subscription, you are can then go ahead and log in to the website, which is ESPN.com. You can watch from a phone, either IOS or Android, a Smart TV, a Desktop or Laptop computer, or a Tablet, basically, any device that has internet access and has an active subscription to ESPN+.
Unfortunately, you won’t be able to watch UFC 252 in the BT Sport. Perhaps you haven’t known this yet; the BT spokesperson confirmed that BT company would end the relationship with the UFC on December 3rd. That means BT Sports will no longer broadcast the UFC events on the channel. The UFC 252 event happens on Saturday, 15 August, 2020. But you can still purchase the PPV through the service.