Full Gears of War 4 support has been added to UE Viewer. To activate it, you should start UE Viewer with overriding game to "Gears of War 4" in user interface, or setting -game=gow4 for command line.

This is not a usual UE4 game, so there are some recommendations about how UE Viewer should be used - you may read them in the game's thread

Please note that UE Viewer is constantly updated, and if you're trying to monitor THIS page to track activity - this is not correct. You should track facebook page (see facebook block right beyond the menu block on the left), forum, or github page.