I tried to use the Help link for an update for my Adobe Lightroom 5 but the link does not connect.

I don't think the online help pages for Lightroom 5 (circa 2014) are still online. You can download a PDF of the "Adobe Photoshop Lightroom 5 Help" from here:

https://help.adobe.com/archive/en/lightroom/5/lightroom_reference.pdf

So I am assuming that by Lightroom 5, you are referring to the old Lightroom 5, about a decade old right now. And I assume you are not referring to the new Lightroom 5, maybe 1-2 years old.

If so, there are no more updates to Lightroom 5, beyond Lr 5.7.1. What is the exact version NUMBER of your Lr 5?