I’ve had the same issue.
After little debugging of AutomationScripts.Automation.dll, I figured out that the real problem is that AutomationScripts.Automation.dll trying to load plugins for different platforms, and failed when trying to load android.automation.dll on windows platform. So I’ve just remove all content from “\Engine\Binaries\DotNET\AutomationScripts” folder except “AutomationScripts.Automation.dll” and “Win.Automation.dll” . After that game launched successfully!