At the point in time I had bought the deluxe version of this game on epic games. It had provided an extra out of game item that was a skin for fortnight, but I can not find how to install it into the game.
You’d need to ask Epic about that, since they’re the Fortnite people. If you got the game on physical media, there should have been a download code included.
where would i find that download code
If it was a redemption code that operates the same way as consoles, it should have been printed on an insert inside the case with the disk. Note that some console players have reported missing inserts.
I would recommend checking with EGS support to find out how they handle these things, though, as it may not be the same as on console.