Epic Games can't login offline

I'm trying to open Epic Games Launcher without internet connection. Epic asks my email, but it shows

Sorry the credentials you are using are invalid or have not been stored for offline use.

So, how to make my credential valid for offline use?

Best Answer

You would need an internet connection upon the first login. This is because the Launcher can't verify that the account details are correct, as it has no idea what the Epic Games Server has. It would also have no way of knowing what you own without an internet connection.

Basically, sign in with an internet connection, then your credentials will be valid.