Autocad Civil: 3d 2014 One Link

If you meant something else by "One Link" (like a specific tool, add-on, or a cracked distribution – which I can't provide), please clarify, and I'll tailor the answer accordingly.

Your best path forward is clear:

Because this version has reached its end-of-life, finding a secure "one link" download from official sources is no longer standard. AUTOCAD CIVIL 3D 2014 ONE LINK

This was the precursor to the modern BIM Collaborate tools. The "Design Feed" feature allowed engineers to post messages and images directly into the drawing environment. These comments were stored in the cloud (Autodesk 360) and could be accessed by team members working remotely. While rudimentary by today's standards, in 2014, it was a revolutionary way to communicate design intent without marking up PDFs manually. If you meant something else by "One Link"