I just reloaded my computer, which included X3, and Dim Pro 1.5 (the most current release for it), and the help file did not load with the install.
I had an error message about not being able to locate the help file, and ended up downloading it from the Cakewalk site.
Here is the link to download the help files for Dim Pro 1.5:
https://www.cakewalk.com/Support/Knowledge-Base/2007013200/Dimension-Pro-1-5-Help-files The article for the above link also states:
"The D-Pro 1.5 ESD installation does not install the help documentation automatically."
Bob Bone