Oh wow… I’m not that up2date with Unity assest store but this looks truely amazing. Unfortunately there isn’t something that cames close to this in the UE4 marketplace right now.
But there are lot of tutorials and it actually makes fun to create something with UE4.
Tutorial example (currently 7 parts) that should give you a good starting point: https://www.youtube.com/watch?v=3GgVUKcGvAY
Pro: You should end with a custom character that could run around, jump, change in aim/combat mode and equip and unequip weapon and because you did this yourself following the tutorial you should have a clue where to change things later.
Missing: Multiplayer needs tweaking (aimoffset is not replicated just movement), Anim montage of equip and unequip is not split into upper body and lower body (could be fixed easy) … jumping in combat mode is not split to upper/lower body (could be fixed easy either). No shooting (could be more tricky in third person than in first person). And compared to your mentioned asset no root motion, no IK, no AI, no climbing, no cover.
Generic Sample Shooter Project in marketplace: https://www.unrealengine.com/content/e1483f96f46b414386bd3ca5de33ed10
Pro: It’s good to get some ideas how others solved issues. You get a first person and third person controller and it’s ready for multiplayer. I consider this pack more like the neighbor in the school when writing a test. I would not use this to build a project on top of this and lot of stuff is still missing and not polished or you would find wires that are not plugged into something right now. There is a lobby system and GUI stuff included. He says “bang” when you hit fire. How cool is that?
Missing (if you would go for 3rd person): You could switch to 3rd person but it’s not really made for 3rd person because camera movement is pretty limited. No turn anim if you change yaw (feet just slide on the ground when turning around) and aim offset just uses pitch (spine does not turn left and right just up and down). No jump, no IK, no AI, no climbing, no cover, no root motion…