Screenshots attached. At first, I thought it was because of SDXC (Sandisk ExtremePlus) SD card was too new. However seeing this is a very common error may be related.
Windows 10 desktop. Fully patched. Downloaded Etcher tonight (both standard 64-bit and portable versions). Installed fine. Screenshot 1 (not shown due to new user limit of 1 image) - immediately recognized SDXC card as soon as I selected the image (2019-07-10-raspbian-buster-lite.zip).
Screenshot 2 - started to say it was “Flashing” and then this error.
Had great luck in past with Windows 7 and raspian-jesse images with Etcher.
Trying older SD card – will reply, especially if it works and not a bug with software.