The numbers are done using Centerline Text. Do you have that add on?
The error message is saying you need both Centerline and Conforming Vectors which are both additional features available at the Carvewright Store.
https://www.carvewright.com/add-on-modules/
Centerline and Conforming Vectors have always been add ons. My guess would be the person posting was indicating that they had accomplished the design without the advanced tools such as Pattern Editing, Pattern Sculpting, 3D sculpting, or other party software. Only the creator can answer for sure, just a guess. Additional info, to use Centerline you will also need a 90 degree V bit and/or a 60 degree to make the cuts.
Rick H