You can find most of the 3 port criteria routines from the above link delivered with the product if you install the samples files when you install GEOPAK.
They would get loaded typically in C:\Program Files (x86)\Bentley\GEOPAK\V8.11\Samples\road\3pc\projects\
Most of the routines are quite old and meant for the 2004 product line.
We will remove the page to limit further confusion.