The Package Error is easy to reproduce:
With the plugin installed in “C:\Program Files\Epic Games\UE_4.20\Engine\Plugins\AdvancedSessions”
- Create an empty project using the First Person Template with “no starter content”, name it “TestProject”
- Open “Edit –> Plugins” from the menu, activate both plugins (AdvancedSession and AdvancedSteamSession), restart Engine
- Open “File –> Package Project –> Windows –> Windows (64 bit)” and package “TestProject”
After a short time you should get the error Krakatoa and me mentioned before.
"ATHelper: Packaging (Windows (64-bit)): ERROR: System.IO.DirectoryNotFoundException: … "
Btw… many many thanks for all your effort and time you put into this great plugin, . I think it should be part of the Engine itself… that would make it a lot more easier for Blueprint Guys like me to use Steam out of the box!