Have the same problem. Eso support send me that mail it didnt help me but maybe u will have more luck.
Thank you for contacting The Elder Scrolls Online team! I'm very sorry to hear you are receiving error "Banana Bread Only a single instance of this application can run"
On your Control Panel, click on "Network and Internet" and open Internet Options to make changes on the following two tabs:
- Connections Tab: Click on the LAN settings button. When the LAN settings window appears, uncheck all the boxes and click on OK.
- Advanced Tab: Click on the Reset button, and then click on Reset again.
Restart your computer to ensure that the changes take effect, and then restart the game launcher.
OR if that doesn't solve the issue,
This error could also occur if you are trying to run an application that is already running in the background. A few ways to find if the launcher is still running and closing it:
System Tray
- On the bottom right side of your screen by the time and date
- Right Click the ESO icon and select Exit or Close.
Closing the launcher via Task Manager
- Open Task Manager via Ctrl + Alt + Del
- Click on the Processes Tab
- Scroll to find “Bethesda.net_Launcher.exe *32” (for the launcher) or “eso.exe *32” (for the game)
- Right-click the process and select “End Process”
- Wait a few seconds, then try to open the launcher or game again