Error upgrading project to 4.13

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Open your Game’s uproject file in a text editor. In your case, I believe this will be:

PROJECTROOT/PunchBomb/PunchBomb.uproject

Inside of that file, look for a “Plugins” JSON array. You’ll need to add the OnlineSubsysteamSteam plugin to this array. This will look something like this:

"Plugins": [
	{
		"Name": "OnlineSubsystem",
		"Enabled": true
	},
	{
		"Name": "OnlineSubsystemUtils",
		"Enabled": true
	},
	{
		"Name": "OnlineSubsystemSteam",
		"Enabled": true
	}
]

Hope that helps!