Install two official clients
Use Steam plus Epic, Steam plus GGG standalone, or Epic plus GGG standalone.
Ultimate requires two different official Path of Exile 2 installations and keeps player-to-client assignment explicit.
Use Steam plus Epic, Steam plus GGG standalone, or Epic plus GGG standalone.
If either client is Steam, open Path of Exile 2 Properties > Controller and select Use default settings before pairing. Do not select Disable Steam Input.
Select split 2P, 3P or 4P before pairing.
Four-player mode assigns P1/P2 to Client 1; three-player mode uses P1; split 2P uses P1.
Four- and three-player modes use P3/P4 on Client 2; split 2P uses P2.
Check both clients and the intended player slots before enabling follow, radar or visual options.