I tried both methods of disabling the Windows 8 signature requirement at https://freevps.us/thread-6845.html
Although both methods proceeded smoothly, when I tried to install the TI dongle, I still received the message about it not having a valid INF signature. I know that the Windows 8 procedures happened correctly because now I have that "Test Mode" watermark on my Windows 8 screen.
This would seem like a serious problem since new Windows machines come with WIndows 8. I notice there has not been a response from TI. Can't we get some drivers that are signed correctly for Windows 8.
Bruce