The only thing that would cause it not to fully load is an antivirus stopping it. It should begin fine on Windows 7 - 10, 32 and 64 bit. Sometimes Avast will stop it.
i do not have Avast. i did disable AVG antivirus but there was no improvement. so you know, i'm running Win7 64. i did also try to disable my windows firewall, even though it hadn't notified me that it was blocking your app. still no fix found.
to recap: the splash shows for a moment and then the screen goes black and i can see that an app named 88032.exe is running in the background... it doesn't seem to be frozen as it doesn't show Not Responding. my mouse cursor over the black screen app shows the blue wheel of infinite waiting, so i guess it's doing something.
Just tested on Windows 10 and 7, 64 bit. It originally was stopped by Windows Defender for being an "unrecognized program" but then showed the splash screen for half a second and then loaded and played fine. I didn't have any firewall or other windows programs interfere with it. 88032.exe is not related to this game and only SIN.exe is. If the splash screen goes away then all assets are done loading and there should be no more delays. Sorry I can't seem to replicate or find the cause of this error.