such that you can either send them to OSHPark or PCBWay or the like to make a set?
Directly or Indirectly? For example one way would be to try to import your design files into another CAD program. I don't have Altium and probably does not make sense for me to subscribe to it... I do have DipTrace and maybe old Eagle version.
Diptrace says it can import Altium Ascii files, but not the ones that are included in the zip file.
It can also import gerber and drill files, but it needs to know how to map which file maps to which function... That is you have:
I would guess that you can just send them the files located in the ASX00085-cad-files/Manufacturing files/Gerber and ASX00085-cad-files/Manufacturing files/NC Drill folders. However, I haven't ever manufactured a PCB so I am not qualified to speak authoritatively on the subject.
Hopefully one of the other forum members who is knowledgeable on the subject will provide a better answer than mine.
If you only want to view the designs, you can use the free web-based Altium 365 PCB viewer:
Altium 365 can also be used to generate Gerber files from CAD source files. Unlike the free viewer, it is necessary to create a free Altium account in order to use this feature. However, that should not be necessary in this specific case, since Arduino included the Gerber files in the ZIP package.
I'd be very hesitant about using those gerber files to make a board.
They look right but there are no silkscreen layers and a few undefined manufacturing layers.
They also included a separate apateur file which is not necessary for the gerbers.
P.S. I used the KiCAD gerber viewer to open the files.
That makes the less than ten $/€/£ price for a fully built board from Arduino look very reasonable.
I'll wait for the official ones to be released.
They look like a good way of mounting an Arduino UNO Q, having 4 screw holes on a nice rectangle pattern. Useful even if you don't use them to breakout signals.