SU-MD-DL, or SU-MD-CA error
This error usually appears when you are experiencing network issues. Please follow the steps in our troubleshooting article for connection issues, found in the article: How to troubleshoot connection issues.
If this doesn't work, please try the steps below to uncheck any proxy settings enabled in the launcher:
Open the Epic Games Launcher.
Click the username icon in the upper-right corner.
Click on Settings.
Uncheck the box Use Proxy if it is checked.