I am having lots of trouble trying to get light to shine through a window I cannot figure out why the light won't shine through the window in my .blend file (linked here).

I've made the glass transparent using the BDSF Transparent Shader. On top of this, all materials are allowing transparent shadows.

The only thing that works is if I uncheck "Cast Shadows" on the light material. Can anyone help me figure this out? Thank you in advance.
For some reason my computer isn't letting me access the file, I don't think it's an issue from your end though. I know I can't offer much assistance, but your question brought to mind a glass hack that I once saw in a video from Blender Guru. The link is here and the node set up is at 5:02 in the video. If this is useless information to you I'm very sorry.