Is it crashing when the Launcher is first opened or when you are using the Launcher to open the Editor?
If it is the Launcher itself crashing, try the troubleshooting steps linked below. If the issue still persist, follow the steps at the bottom and post your ‘Verbose Logs’. They are different than the logs you have posted and are Launcher specific.
Hi Tmo,<\br><\br>This seems to be popping up here and there, it is a corrupt png file in you local content cache. I’m aware of the issue and working on a fix, but for now, you can get going by removing you cached files (marketplace images will be re-downloaded).<\br><\br>You will find the folder here, you can remove or rename it<\br> C:\ProgramData\Epic\UnrealEngineLauncher\Data\ContentCache
<\br><\br>Let me know if that helps,<\br>Thanks,<\br>Leigh