Cheers. I noticed the same thing but just pressed quit without even noticing the continue option.
Same issue here, Server 2008 Standard x86.
For reference for anyone who find this post through a search:
The IntelliType installer checks and doesn’t let you install it on Server OSs but you can extract the exe with 7Zip or something and then run setupstb.msi in the extracted files.
For me, after installing, all extra keys worked right away and yet to see any issues.