I'm attempting to put Raspbian Jessie on an SD card. (I'm choosing Jessie to eliminate a possibility of incompatibilities with the SW I plan on using. I may use Buster after getting everything working with Jessie first.)
I'm using Raspberry Pi Imager 1.2 and a Jessie image from http://downloads.raspberrypi.org/raspbian/images/
First I tried the 2017-07-05 version of Jessie, which I believe is the last. I choose the unzipped img file and card to write to, then select "WRITE". I then receive the following error:
I then tried the 2017-06-21 version and got the same result. I verified the checksum of both downloaded zip files.
When using the 2020-02-14 version of Buster from that same image directory, the Imager accepts it.
I take it I'm either doing this wrong, or the the Raspian images made before the existence of the Pi Imager are simply not compatible. Which is it?