The files seem to be provided in a .exe archive which unloads them at: C:\Users\Public\Documents\Vectric Files\Design&Make
Note that there is an option to indicate which Vectric software you own so that the web site will indicate which files you already own.
Launch the application — you can manually load the file if you know its name and location by navigating to it — given the obscure filenames, it’s a shame that there isn’t some sort of interactive browsing option other than the web interface.
Apparently the only option is a .v3m file which you can then load into Vectric software (Cut2D is the least expensive specified) — rather than allow directly opening, the file has to be imported, then one can arrange toolpaths as desired — which seems rather redundant given the need to assign endmills, feeds, speeds, and post-processor in Design and Make.
I will say that Design and Make integrates nicely with Vectric products such as VCarve Desktop. I have purchased several models and have been very happy with them.
I was able to cut this after signing up for free using the design & make software. I exported it to Grbl and was able to run it in Carbide Motion. 1 hour for roughing and 1 hour for finishing using a 1/8" Ball nose. The design I cut was 6" X 6".