Two questions from a daft old bugger who has lost his way
One - is there a 'Net Install' iso download ?(I'm sure there used to be)
Two - How do I check whether I'm running 64bit or not?
1. Not in Sparky at least. The installer runs locally. There were some aspects of downloading packages from the net (translation packages mostly), but none of it remains for the time being. Maybe in the new installer that we're planning, that will merge the old and the current one and add some more functionality.
2. "uname -m" should do the trick as @way12go suggested.
Furthermore: for determining if you're running a BIOS-booted or UEFI-booted environment refer to the contents of the /sys/firmware directory. If there's a "efi" subdirectory with content inside, then you're running an UEFI-booted environment. Hmm... I guess this will be useful information for the bug reporting tool (arch and either UEFI or not).