Why is DataStore2 not working after I tested?(Please help)

Hi, I'm trying to learn how to use datastore 2, this is what I got and whenever I play and rejoin, it doesn't save. I can't test it on the studio as there is already a player in the Players section. So there wouldn't be any player added. Also, is it just me are is everyone having a new icon in the explorer name CorePackages that can't be deleted?

local DataStore2 = require(1936396537)
DataStore2.Combine("MasterKey", "Kills", "Deaths", "Coins")
game.Players.PlayerAdded:Connect(function(plr)
	local datakill = DataStore2("Kills", plr)
	local datadeath = DataStore2("Deaths", plr)
	local datacoin = DataStore2("Coins", plr)
	-- leaderboard
	local stats = Instance.new("Folder")
	stats.Name = "leaderstats"
	stats.Parent = plr
	
	local kills = Instance.new("IntValue")
	kills.Name = "Kills"
	kills.Parent = stats
	kills.Value = datakill:Get(0)
	
	local deaths = Instance.new("IntValue")
	deaths.Name = "Deaths"
	deaths.Parent = stats
	deaths.Value = datadeath:Get(0)
	
	local coin = Instance.new("IntValue")
	coin.Name = "Coins"
	coin.Parent = stats
	coin.Value = datacoin:Get(0)
	
	-- Save Kills
	datakill.Changed:Connect(function()
		datakill:Set(kills.Value)
	end)
	-- Save Deaths
	datadeath.Changed:Connect(function()
		datadeath:Set(deaths.Value)
	end)
	--Save Drachmas
	datacoin.Changed:Connect(function()
		datacoin:Set(coin.Value)
	end)


	-- On death event
	plr.CharacterAdded:Connect(function(char)
		local humanoid = char:FindFirstChild("Humanoid")
		humanoid.Died:Connect(function()
			deaths.Value = deaths.Value + 1
		end)
	end)
end)

Help please, Thank you!