@elektro, i have some context that should help with the situation.
He first sent an email to us with the issue, and I told him to file a bug here on the forums.
Here are some pictures he sent me:
My first recommendation to you @powersam21 is that you make sure when the application asks to install fonts, you press yes. If it fails to install them, you may need to run the application as admin. (Right click exe -> Run as admin)
If that does not work, or does not apply, we will need your diagnostic log files to see what the issue exactly is. You can see how to do that here:https://forums.relhaxmodpack.com/index.php?topic=52.0
Hope this clears things up!