This thread was originally created back in March, and we should have closed it after the known issue was resolved. I am going to close this now, so that we can ensure that people are directed to the proper support channels.
If you are experiencing an issue with the Epic Games Launcher, first please review the Troubleshooting guide to determine if any of the solutions may help you: https://wiki.unrealengine.com/Troubleshooting_Launcher_Problems
If nothing in the guide helps, then please refer to the Installation & Setup section of the UE4 AnswerHub, which is where we review and assist with Launcher issues. First, please look through the current posts to see if the issue you are experiencing may be a widespread issue that Epic is already working to address. If it’s not, then you should run a search for your specific issue to see if anyone else has also experienced it, and if they have identified a solution. Finally, if you determine that your issue is unique, please make a new post, and be sure to include logs (the process for which is described in the troubleshooting guide).