Sorry, after re-reading your posts, I had skipped over the fact that you had already wiped it:
since I've been able to erase it with the Mac disk utility to give a single FAT32 MS Dos partition.
So if you've re-copied the noobs files back to the card, then 'runinstaller' would already be there (it is deleted once it has been booted properly).
But you are saying when you boot this card with NOOBS on it, NOOBS is failing to partition the card. This could be for a number of reasons (the formatting & partitioning tools can be a bit picky), but a common solution is to try formatting it in a digital camera and then try copying NOOBS back onto it again. Formatting the card as a Unix partition will not work. It must be FAT32 (or FAT16 or FAT12). And it must use an MBR partitioning scheme (not a superfloppy or GPT, but these are not the default options for an SD card such as yours)
You might be better off just trying to flash an image directly to the SD card instead of using NOOBS.
As well as the new Raspberry Pi Imaging utility, there is the older Balena Etcher tool that might work better on your Mac.
Failing that you could resort to the basic cmdline Unix tools of dd or cp to transfer the image to your SD card (But I don't know enough about the Mac to know what the SD card device would be called to help here. Just make sure you copy it to the correct device as it could trash your hard disk if you choose the wrong device! That's why Etcher would be a better bet).
In any case, you would have to flash the Raspbian image directly to the card, so it means downloading that image from the RPF website first. You cannot flash NOOBS in this way because it is a zip file of files, not an image.
If you really want to use NOOBS, another way to format your SD card is to use Etcher or dd to flash an empty FAT32 partition image that you can find on my github here ->https://github.com/procount/fat32images
. then you can copy the NOOBS files to the card and boot. That might fix the partitioning issue you have
Of you could flash my pinn-lite image (https://sourceforge.net/projects/pinn/f ... ip/ownload
) using Etcher or dd directly, which is like NOOBS only with more features (like backup & restore etc) and more choice of OSes.