Hi @msg6, thanks for your query. As you are probably aware, the EyeX SDK has since been deprecated and replaced by the Tobii Core SDK and is no longer made available for public download.
However, I can provide you the last release (v1.8.498) of the EyeX SDK if you PM with your contact details which includes both the 32 and 64bit libraries.
The Tobii Eye Tracking Core software you cited is not directly related to the EyeX SDK but instead functions as a means to calibrate and store user profiles along with some tools for Windows Interaction and Gaming.
That being said, the syntax for the new Core SDK is very similar to the older EyeX SDK so if you have the time, it may be worth considering migrating to the newer platform if possible. Thanks.