Ps4 – Dark Souls 3 DLCs cannot be installed on the PS4

If you select download it should only download the license.

Like games that come with pre-order bonus, if you download them, ever noticed they are only a few KB downloads? This is because the items are already in the game, the download is just the license/activation.

So if you select to the-download it should only take two minutes at most to go threw your download then it'll finish.

The fastest way to start PvP is to reach the second bonfire at the High Wall of Lothric, then return to Firelink Shrine. When you return, there should be an NPC named Leonhard leaning against Lothric's throne. He will give you Cracked Red Eye Orbs, which are one-time-use items that allow you to invade another player's world. You can get more of these items from the dark wraiths near the Farron Keep Perimeter. If you continue to follow Leonhard's questline, you'll eventually get a Red Eye Orb, which can be used an infinite number of times to invade.

You can also get the Red Sign Soapstone from a spell-casting worm outside of the Rosaria's Bedchamber bonfire (in Cathedral of the Deep), which allows you to be summoned for PvP in other people's worlds. If you see a summon sign that is red, it means that someone else used the Red Sign Soapstone -- if you interact with the red summon sign, you can summon them into your world for PvP.

There are also covenants you can join that will auto-summon you to other people's worlds for PvP. These covenants include the Watchdogs of Farron, Blue Sentinels, Aldritch Faithful, and Blades of the Darkmoon.