I have just encountered this issues and managed to fix it by doing cmd+i on the ~/Documents/UnrealEngineLauncher folder and applying permissions to enclosed items
@Anadin That worked for me! Thanks!
Unfortunately it appears that this is an older log, which doesn’t exhibit the problem you are experiencing. Are there other logs in this folder? If so, could you zip up any logs which have been generated in the last two days and post them here? Thanks!
UPDATE:
We’ve released a new update for the launcher today to fix some issues that occurred with the recent Launcher release on Tuesday 5/6.
For more information you can find check out the forums (Link Here)
5/9 Release Notes - Launcher version 1.2.1-2068268
–Bug Fixes–
Right-click uproject options do not work on Windows
Launcher becomes unresponsive when updating from 1.1.0-2054669 to 1.2.0-2064046 with UE_4.1 and all 4.1 samples downloaded
Just hang on login after update… re-downloaded from web and installed following with no change
EpicGamesLauncherInstaller-2.3.0-2602894.msi
GPU GeForce GTX 660 Ti - Driver V.353.62
CPU Intel(R) Core™ i7-3770 CPU @ 3.4GHz
16 GB RAM
OS: MS WIN 8.1 Pro Media Center