For 0.4.5 from anon link, to get past the black screen crash use the exe (steam removed) from the below post
Then to workaround the dummyauth.. error
You need to get a steam emulator...goldberg emulator works
To get it working replace the steam_api64.dll file in Engine\Binaries\ThirdParty\Steamworks\Steamv147\Win64 with the one you get from goldberg.
Remove existing mindflayer certificates and FallenDollLauncher.exe
Boot with Mindflayer 1.0.1 should work
user0609 you teased everyone a bit hard I must say