impossible, it can't possibly save in adobe because its a webpage
It's completely possible. It's called printing to a file, a practice which is no longer common now that printers are affordable enough for everyone to have one sitting on their desk. Windows defaults to printing an XPS file if no other printer is installed or set as default.
OP: Have you made sure you installed the driver for your printer? Make sure you select the printer you want to print to in the Name drop down menu on the Print dialog box.
It may sound a little 'off', but you probably haven't gotten him everything yet. You can purchase for him a Premium Membership. This would preclude any need for printing off a few caches. He would have direct access to all caches.
It's really unnecessary to suggest a Premium Membership for this. I can see telling someone they need a Premium Membership if they come to the forums asking how to filter caches by attributes or have notifications sent to their phone or email, but all the OP wants to do is print a cache page.
Many thanks, I was doing the wrong thing, but have done it now thanks