DAP-2695A1 initial install

Trying to do an initial install on D-Link DAP-2695 A1;

The OpenWrt Firmware Selector shows 2 images, factory and sysupgrade.

Since it is initial install, I understand I should choose factory, which is this:
openwrt-19.07.8-ar71xx-generic-dap-2695-a1-squashfs-factory.img

When I try to flash it directly to the DAP-2695, I get the following error:
The chosen file is not an image file.

Windows 10 shows this as a disc image file, but if I try to open it, it says it is corrupt.

New to this, any ideas?