On my Mac, I generally use Etcher. Despite warnings from some on Pinside, I've never had an issue with Etcher until Dave's image file! For that, I had to go back into my Windows VM and flash it using Pinball Browser itself, which I had never had use before for that purpose. That worked!
The internal SD card slot on Macs is not on the USB bus, so you can't move cards plugged into the slot into VMs. You can get inexpensive USB card readers of all varieties, and they work fine, even the super cheap ones.
Long story shot, if you're a Mac users like me, try Etcher out first. If that doesn't work, you'll need a VM running Windows and a SD card reader to flash with Pinball Browser.
Etcher works perfectly fine to flash Stern's stock SD card image downloads. The problem seems to be with some image files after being modified by Pinball Browser. Etcher is updated all the time, so hopefully whatever bugs related to Pinball Browser generated images that have popped up lately get fixed.