It's still stuck on the connection thingy.
The same thing happens for other eclipse MMOs as well.
For the library files installer, I ran both the windows 7 one and the one in the original game download. The 6th file from the bottom is not copied for some reason on the slim installer.
For the windows 7 one, I get an error if I don't run as an admin but none if I do.
EDIT: Ahha, I fixed it. Apparently having my locale set to Japan was messing it up, but now it works. Too bad I have to sacrifice my touhou 12.3 for it