Some sign in issues with Epic Games launcher is due to issues with the servers. Make sure that you check the server status of Epic Games from their official website.

If you're trying to launch Fortnite via the Epic Games Launcher you may be staring at a Servers Offline notice, but there is a fix.

After that, select the Installing option, then select the Epic Games Launcher app, press Next, and let it detect the issues that are blocking you from installing the software.

3 Ways to Play Fortnite on Mac As mentioned, you have the option of running the Epic Games launcher natively on your Mac.